{"id":703,"date":"2015-03-24T15:25:17","date_gmt":"2015-03-24T15:25:17","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/?p=703"},"modified":"2015-03-24T15:25:54","modified_gmt":"2015-03-24T15:25:54","slug":"structures-and-links-database","status":"publish","type":"post","link":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/03\/24\/structures-and-links-database\/","title":{"rendered":"Structures and  links  (database)"},"content":{"rendered":"<ul>\n<li>Database structure: field, record, file<\/li>\n<li>Database structure: flat file, linked tables, primary keys, foreign keys<\/li>\n<li>Field types (text, numbers, date, time, graphic, object, calculated, link, boolean)<\/li>\n<li>Validation (presence check, restricted choice, field length, range)<\/li>\n<li>Database operations search, sort (on multiple fields)<\/li>\n<li>Good design to avoid data duplication and modification errors (insert, delete, update)<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h2>Database structure<\/h2>\n<ul>\n<li><strong>field<\/strong> &#8211; the fields below; Exhibitor, Company Name, Area, Stand Number, Product Reference, Item Name, Price (\u00a3)<\/li>\n<li><strong>record<\/strong> &#8211; A single row in a table, there are 8 records below<\/li>\n<li><strong>file<\/strong> &#8211; the entire database<\/li>\n<li><strong>flat file<\/strong> all the data is stored in one table<\/li>\n<li><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1.png\"><img decoding=\"async\" data-attachment-id=\"720\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/03\/24\/structures-and-links-database\/attachment\/1\/\" data-orig-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1.png\" data-orig-size=\"480,220\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"1\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1-300x137.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=ea1343be0b079a1eb9694d207e80aeccd4732c80ce9d025e7416f975a80aa596\" data-large-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1.png\" class=\"alignnone wp-image-720 size-full\" src=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1.png\" alt=\"1\" width=\"480\" height=\"220\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1.png 480w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1-150x68.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=ffe18119a7def2f2cf80810e92812633ced9cbb93b000b42f8bc140c1a7552cd 150w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/1-300x137.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=ea1343be0b079a1eb9694d207e80aeccd4732c80ce9d025e7416f975a80aa596 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/a>\n<ul>\n<li>Drawbacks Data duplication Data inconsistency or update\/ deletion\/insertion anomalies Data integrity errors (due to data inconsistency) Inconsistent search results in multi-value fields<\/li>\n<\/ul>\n<\/li>\n<li><strong>linked tables<\/strong>\u00a0data is stored in tables that are linked together.\n<ul>\n<li>The table above would be split into<\/li>\n<li>EXHIBITOR(<span style=\"text-decoration: underline\">Exhibitor Code<\/span>, Company Name, Area) P<\/li>\n<li>RODUCT(<span style=\"text-decoration: underline\">Product Ref<\/span>, Item name, Price (\u00a3), Exhibitor Code*)<\/li>\n<li><span style=\"text-decoration: underline\"><strong>primary keys<\/strong><\/span> &#8211; these are unique identifiers for each row in a table<\/li>\n<li><strong>foreign keys*<\/strong> \u2013 a primary key from a different table<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>Database operations<\/h2>\n<ul>\n<li><strong>Simple search<\/strong> \u2013 a search on ABC Music would return the following<\/li>\n<li><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2.png\"><img decoding=\"async\" data-attachment-id=\"721\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/03\/24\/structures-and-links-database\/attachment\/2\/\" data-orig-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2.png\" data-orig-size=\"480,43\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"2\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2-300x26.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=b85da3e50a969cfb9a24f7507ba3935fef456d240815bdfd6647266e660d0ef6\" data-large-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2.png\" class=\"alignnone wp-image-721 size-full\" src=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2.png\" alt=\"2\" width=\"480\" height=\"43\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2.png 480w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2-150x13.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=6e356fd230abe2f42c0d491e180d3ead79598449be96ceef1003e35d3089cdc1 150w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/2-300x26.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=b85da3e50a969cfb9a24f7507ba3935fef456d240815bdfd6647266e660d0ef6 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/a><\/li>\n<li><strong>Complex search<\/strong> \u2013 Searching on two (or more) fields at once for example\n<ul>\n<li>Company name = FutureTech and Price &gt; 1500 would return the following<\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3.png\"><img decoding=\"async\" data-attachment-id=\"722\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/03\/24\/structures-and-links-database\/attachment\/3\/\" data-orig-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3.png\" data-orig-size=\"480,21\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"3\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3-300x13.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=879a3cc7bc2ffa9ed3bf933e11a82a7a01780cca39eafc0137152147827444b9\" data-large-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3.png\" class=\"alignnone wp-image-722 size-full\" src=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3.png\" alt=\"3\" width=\"480\" height=\"21\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3.png 480w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3-150x6.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=71bc4ef23c132dc5e94e874eea7cbdd4629c3f284a8486b2b88843f184eab376 150w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/3-300x13.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=879a3cc7bc2ffa9ed3bf933e11a82a7a01780cca39eafc0137152147827444b9 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/a><\/li>\n<li><strong>Simple sort<\/strong> \u2013 Sorting a table by one field, class registers are sorted by surname\n<ul>\n<li>Allan, Tom<\/li>\n<li>Bennet, Gordon<\/li>\n<li>Clark, Petula<\/li>\n<li>Donaldson, Luke<\/li>\n<li>Elliot, Paula<\/li>\n<\/ul>\n<\/li>\n<li><strong>Complex sort<\/strong> \u2013 same as above but if two people have the same second name they are sorted by first name as well\n<ul>\n<li>Allan, Tom<\/li>\n<li>Bennet, Gordon<\/li>\n<li>Clark, Petula<\/li>\n<li>Donaldson, Luke<\/li>\n<li>Elliot, Paula<\/li>\n<li>Ferguson, Alex<\/li>\n<li>Ferguson, Sarah<\/li>\n<\/ul>\n<\/li>\n<li><em>This is in Alphabetical or Ascending order<\/em><\/li>\n<\/ul>\n<h2>Field types<\/h2>\n<ul>\n<li><strong>text<\/strong> \u2013 A Roberts, ML1 3XF<\/li>\n<li><strong>numbers<\/strong> &#8211; 124<\/li>\n<li><strong>date<\/strong> \u2013 29 April 2012<\/li>\n<li><strong>time<\/strong> \u2013 08:30<\/li>\n<li><strong>object<\/strong> \u2013 Picture, video or sound file.<\/li>\n<li><strong>calculated<\/strong> \u2013 pay * 20%<\/li>\n<li><strong>link<\/strong> \u2013 www.bbc.co.uk<\/li>\n<li><strong>Boolean<\/strong> \u2013 either yes or no<\/li>\n<\/ul>\n<h2>\u00a0Validation<\/h2>\n<ul>\n<li><strong>presence check<\/strong> \u2013 data must be entered before the user can continue, usually has a star.<\/li>\n<li><strong>restricted choice<\/strong> &#8211; please see below, the user can only select one option.<\/li>\n<\/ul>\n<h3 style=\"padding-left: 30px\">Benefits<\/h3>\n<ul>\n<li>Reduces the chance of human error<\/li>\n<li>Does not require the user to type a text response<\/li>\n<li>Speeds up the ordering process as inputs are reduced to mouse clicks<\/li>\n<li>Allows the use of a touchscreen<\/li>\n<\/ul>\n<h2>Design<\/h2>\n<p>Good design to avoid data duplication and modification errors (insert, delete, update)<\/p>\n<p>Flat file databases can lead to errors as shown below<\/p>\n<p><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4.png\"><img decoding=\"async\" data-attachment-id=\"723\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/03\/24\/structures-and-links-database\/attachment\/4\/\" data-orig-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4.png\" data-orig-size=\"529,155\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"4\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4-300x87.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=48a7ecb06160f23f33b65129893e7e28fb744893994ce9213895981a444d31c8\" data-large-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4.png\" class=\"alignnone wp-image-723 size-full\" src=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4.png\" alt=\"4\" width=\"529\" height=\"155\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4.png 529w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4-150x43.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=b2433395582fa6c7e02dcfb47b2be8d949086ae467df628df1dbfad0ddc355cb 150w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/4-300x87.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJGMEQCIFq%2FrG0SEGrJTPK34RF%2BnN8BygKOQpIzkZlukrbkepAMAiA7rn0XEmvmBIj0lczW4xf8%2BtWuz9NSOyZIa7vXEL8BoSq5BQhrEAUaDDI3MzU3MDE5NTQzMyIMHT1logv2lI%2BjE%2Bi1KpYFWQvEj8byMy1yehuEL41rCLIZZ8COJlMgnsraB7yAscwtJWT49c%2ByQ9a2GH5sXmcf%2BZyOn%2F73aVRJ1jZ7zLRno12eFZtwJJyKkILg48TSGXZJTU3y719%2FUIXVl8eUk%2F6Zy70hmzsklIbRhIx790B0CBpxmyS%2BImJyyuzHTzdCI%2BGPCN4v9HA2E2Z6Usj6o2u1%2FIRuPX1UrC1VhI9tcWb2628R3eFAiApUSRl%2BnUHnBzAB9yzZUvBESkg%2BSnX65yENZIOsGPOgAAnEV%2B5YizxGNQxircBU0hxYwPWUmjTCYfJdvqtTpQMi5SvZB2W2rd0eNgRgaLoh9UoYS%2FpEhoYtEbe5RPy%2FJZ0sGg21aPzX%2F%2F5%2FVmcAzR4tFv%2Bbgw1pbVFRuc%2FyxJ0fRQttZT9qL6hIdsKSLo2%2BinGKwRCEi3Hy93gMQnduGQ4BPN0A7bL3l3u4LqmKp90yUCA9ZXrBT%2FnTHNJJ7FJPLSnKvXSfCE544xSQrCYyyamIvIwN2HqOOg1s%2FkFne6vEWbOJmSpxndfKLW4Jv6UgqTGIkhWWQnczbQ2Fmc8fTVarFGaMOwKJpPZUW%2B3HDRAga%2BI9lhEaCkwPpFCuNs2yWWLRqebEF5Hfbiauz%2FepmRe%2BVUS352lF1Qngz%2FjXh258MNdTgS%2Fzc6lhd8R59zpeQ7bxB3UTqHUCk4VtbTHTK2jZJ5Uk24KbAGifVrZNTzJQZd9kEbFpZ6XRmfS4SuTl6DWKSTPn%2Bo2WktC3aQzrcwR%2FUmnFOtJ0Nswn2qO6gPo90TkvbPx6EuANwjYnZ1cID8EMtMG2Yafz7FhXaQd%2F1KmuOMk%2FiEKHK%2BShoy4otV%2FZ98fjkAMbrp45BxzFL2W6waAbBxKHGuWIQ1GtndjhSjYwof2d1wY6sgG3vUiY2xgVf3cAiExi%2FlclpKno5lswqJ%2Fy1IH5ZkOPvY3lz21h30pz24QJr5gzWQvko4prbMFFRIJDOXrlUCW6y1FU1LHrJxWb%2BvVbKT3VVxvOTnGJQ2BfSEBFOrmUuixtJhgri6kZrHUC7JUn%2FCIBcJjAMR6jid65XjTfKQJ%2Bkfc4TlsI31bKDwWtlTo2IIl1xiOktjfu3Q8fiuFbxNLTZGG3oArlpfS4m%2BUyYl2fqDO6&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U4Y3WCXHX%2F20261101%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20261101T180728Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=48a7ecb06160f23f33b65129893e7e28fb744893994ce9213895981a444d31c8 300w\" sizes=\"(max-width: 529px) 100vw, 529px\" \/><\/a><\/p>\n<p>Is Member Number 1034 a man called John Silver or a woman called Joan Silver?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Database structure: field, record, file Database structure: flat file, linked tables, primary keys, foreign keys Field types (text, numbers, date, time, graphic, object, calculated, link, boolean) Validation (presence check, restricted choice, field length, range) Database operations search, sort (on multiple fields) Good design to avoid data duplication and modification errors (insert, delete, update)<\/p>\n","protected":false},"author":32,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17010,17013,475],"tags":[455,33639,33642,33640,33641],"class_list":["post-703","post","type-post","status-publish","format-standard","hentry","category-information-systems-development","category-national-5","category-revision","tag-database","tag-flat-file","tag-foreign-keys","tag-linked-tables","tag-primary-keys"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/703","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/users\/32"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/comments?post=703"}],"version-history":[{"count":3,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/703\/revisions"}],"predecessor-version":[{"id":725,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/703\/revisions\/725"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/media?parent=703"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/categories?post=703"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/tags?post=703"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}