{"id":1183,"date":"2016-04-13T09:38:19","date_gmt":"2016-04-13T09:38:19","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/?p=1183"},"modified":"2016-04-13T09:38:19","modified_gmt":"2016-04-13T09:38:19","slug":"national-5-structures-and-links-database-revision","status":"publish","type":"post","link":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2016\/04\/13\/national-5-structures-and-links-database-revision\/","title":{"rendered":"National 5 &#8211; Structures and links  database (Revision)"},"content":{"rendered":"<h3>Database structure:<\/h3>\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<\/ul>\n<h3>Flat file database<\/h3>\n<ul>\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\/2016\/04\/DB1.png\"><img decoding=\"async\" data-attachment-id=\"1184\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2016\/04\/13\/national-5-structures-and-links-database-revision\/db1\/\" data-orig-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2016\/04\/DB1.png\" data-orig-size=\"588,269\" data-comments-opened=\"1\" 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150w, https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2016\/04\/DB4.png 969w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Is it a man John Silver or a woman Joan Silver for member 1034?<\/li>\n<\/ul>\n<h3><strong>Linked tables<\/strong><\/h3>\n<ul>\n<li>Table would be split into\n<ul>\n<li>EXHIBITOR(Exhibitor Code, Company Name, Area)<\/li>\n<li>PRODUCT(Product Ref, Item name, Price (\u00a3), Exhibitor Code*)<\/li>\n<\/ul>\n<\/li>\n<li><strong>primary keys<\/strong> &#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<p>Database operations<\/p>\n<ul>\n<li><strong>Simple search<\/strong> \u2013 a search on ABC Music would return the following\n<ul>\n<li><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/files\/2016\/04\/DB2.png\"><img decoding=\"async\" data-attachment-id=\"1185\" 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150w, https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2016\/04\/DB21-e1460539762755.png 588w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/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>This is in an\u00a0Ascending order<\/li>\n<\/ul>\n<h3>Field types<\/h3>\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<h3>Validation<\/h3>\n<ul>\n<li><strong>presence check<\/strong> \u2013 data must be entered before the user can continue, primary and foreign keys are normally required.<\/li>\n<li><strong>restricted choice<\/strong> &#8211; please see below, the user can only select one option.\n<ul>\n<li><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2016\/04\/DB3.png\"><img decoding=\"async\" data-attachment-id=\"1187\" 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150w\" sizes=\"(max-width: 203px) 100vw, 203px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n<li><strong>Benefits<\/strong>\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<li>Good design to avoid data duplication and modification errors (insert, delete, update)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Database structure: field &#8211; the fields below; Exhibitor, Company Name, Area, Stand Number, Product Reference, Item Name, Price (\u00a3) record &#8211; A single row in a table, there are 8 records below file &#8211; the entire database Flat file database flat file all the data is stored in one table Drawbacks Data duplication Data inconsistency 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