{"id":195,"date":"2021-03-22T14:54:38","date_gmt":"2021-03-22T14:54:38","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/?page_id=195"},"modified":"2021-03-25T15:36:53","modified_gmt":"2021-03-25T15:36:53","slug":"primary-key","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/creating-a-database\/primary-key\/","title":{"rendered":"Primary &amp; Foreign Keys"},"content":{"rendered":"<h1><span style=\"color: #339966\">Level &#8211; National 5+<\/span><\/h1>\n<h1>Primary Key<\/h1>\n<p>Every table should have a primary key &#8211; a unique identifier for each record.<\/p>\n<p>Primary keys are required (Not Null), and\u00a0must be unique<\/p>\n<ul>\n<li>Right-click on the Table name<\/li>\n<li>Select &#8220;Modify table&#8221;<\/li>\n<li>Tick the NN, PK and U options for the primary key<br \/>\n<img decoding=\"async\" class=\"alignnone size-full wp-image-301\" src=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24122947\/DB4SQL-primary-key.png\" alt=\"\" width=\"610\" height=\"82\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24122947\/DB4SQL-primary-key.png 610w, https:\/\/glow-prod-sh.s3.eu-west-1.amazonaws.com\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24122947\/DB4SQL-primary-key-300x40.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEMn%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIQDyTuSdHYwi6yyjVqwhBDeBQXvmHq4xYwwZUv%2BqHlQffgIgQogEL%2Ft%2BM4nUHcxwuomrAmEJFgYgAiyL4vA6foVaI4sqwgUIkf%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDCjZ5wNguqigR7Z%2F%2ByqWBfY9clQj6H1Q8gdc8vNXu%2Bu4ASWOYX0woG7nYi9eJy0YASAACe%2B9ghk8o0Kxi1P2hv1qlngZJlAZ6UXtNeCIIKaCV8XlOIdBD%2FJV5wUbhvqugkCTX1xrjhLrwXSqntbpZZzOUkRLeiu5UR2eBgHbyrdDnghzh7%2BhwnCewcYoRmQZ1JcZ8GVQ5CpqtJOT7wnDhVlDCX3wkVBSWU8Sb1qApRg7vhGRdZhgKsiXi0yE2mz4MZK7xGNxO34yunaM9hn%2BpnghGtF7su8rFmLqxPX%2BITyP%2BswjYkBHmMKTU7xXohfPdDyPxcGdaz7vPOQkF69%2B6xhoO%2Fny0RKT8U%2BYmRofUDu6F51wRPFvPMFarTYGaie2nqg6uk%2FLbSFLI1zHNKO0ORln5cJkt%2FvrpZfjg73rZEMUQwOm2fVU4CnA47rP7H%2FoXywbW7GAisbXO%2BrU%2BJhcATlCBKUBwlkNlY2EZqc3Mj6g6QJfY0w9fM56mKOy1wBRh5%2FHgwWNJSEUU2dsSPMIzIm0fw6X24DbQvFJGmiGCOl5IB3Q25h0eJv24N87cy1Faf%2FDSKuwcE%2FGnPiVGejP7bxxNbq2WecSBB9AHbKG4bVdDomr%2BHyH9yuEtS0w%2BdLN6K5RQc%2FiECgk5GJXP3NoVLKBBHWbCnToR5KxnYHIgLCjMNCkCXOGsbPIpyHECPRz6FAKqxE6EbPooAsFlkwf5IvEsupNd9wAn%2FFnNUSw9yV9B9qHxF6M8nsTI9RwUfAFZZvHJs0xXlDxldxaED4OJ9OMm1weH8ksobuuk1N%2FiaMRFFAtWIuZC17MAJtTQ9ImQXG68P3h307zKuH2YbSuE15d3n0Q2JMvo5lJFLZPEkvbpYBpLFCiedFwcjnIdjxyCAaWG5wCMM%2FQnNQGOrEBfUzAN3baoPfhFg6rQDTrZVhebWyqOL2bHpMvrqR5KCx%2F8wHInU%2F0tfrQFJFPUReZw70eBV%2BtMl6trhZveywGzaQ%2BXWCg8750I0%2FvE2TJmuKBYxADRNQj6uRZ73zzVW8UNbZI4Hs%2FSK070vTxey%2FubZGfkt%2Bxj1%2FlLJyD9hOAce7Azg43K7VAjHdzofgegchn3CWg0Aa1pVs5dvsJPgXZzb5nyZek4OIvJAE5n%2BJipxDp&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UWH7ZQ6J2%2F20260820%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260820T165201Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=899&amp;X-Amz-Signature=50944779233af8c9d2b1d19aef5e6c1d3733fc161b55c0bb09f411c33b0d0a32 300w\" sizes=\"(max-width: 610px) 100vw, 610px\" \/><\/li>\n<\/ul>\n<hr \/>\n<h1>Foreign Key<\/h1>\n<p>A foreign key connects each record in a table to a record in another table. The other table must be created before the tables can be linked.<br \/>\n<em>eg Each record in &#8220;appointments&#8221; table will link to a customer. The customers table must be created before the appointments table.<\/em><\/p>\n<ul>\n<li>Right-click on the Table that has the foreign key<\/li>\n<li>Select &#8220;Modify table&#8221;<br \/>\n<img decoding=\"async\" class=\"alignnone size-full wp-image-308\" src=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125204\/DB4SQL-foreignkey-1.png\" alt=\"\" width=\"334\" height=\"160\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125204\/DB4SQL-foreignkey-1.png 334w, 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300w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/><\/li>\n<li>Widen the table so you can see the Foreign Key column<br \/>\n<img decoding=\"async\" class=\"alignnone size-full wp-image-307\" src=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125203\/DB4SQL-foreignkey-2.png\" alt=\"\" width=\"497\" height=\"160\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125203\/DB4SQL-foreignkey-2.png 497w, 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300w\" sizes=\"(max-width: 497px) 100vw, 497px\" \/><\/li>\n<\/ul>\n<ul>\n<li>Double-click where the foreign key row and the Foreign Key column cross:<br \/>\n<img decoding=\"async\" class=\"alignnone size-full wp-image-309\" src=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125636\/DB4SQL-foreignkey-3.png\" alt=\"\" width=\"606\" height=\"83\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125636\/DB4SQL-foreignkey-3.png 606w, https:\/\/glow-prod-sh.s3.eu-west-1.amazonaws.com\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125636\/DB4SQL-foreignkey-3-300x41.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEMn%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIQDyTuSdHYwi6yyjVqwhBDeBQXvmHq4xYwwZUv%2BqHlQffgIgQogEL%2Ft%2BM4nUHcxwuomrAmEJFgYgAiyL4vA6foVaI4sqwgUIkf%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDCjZ5wNguqigR7Z%2F%2ByqWBfY9clQj6H1Q8gdc8vNXu%2Bu4ASWOYX0woG7nYi9eJy0YASAACe%2B9ghk8o0Kxi1P2hv1qlngZJlAZ6UXtNeCIIKaCV8XlOIdBD%2FJV5wUbhvqugkCTX1xrjhLrwXSqntbpZZzOUkRLeiu5UR2eBgHbyrdDnghzh7%2BhwnCewcYoRmQZ1JcZ8GVQ5CpqtJOT7wnDhVlDCX3wkVBSWU8Sb1qApRg7vhGRdZhgKsiXi0yE2mz4MZK7xGNxO34yunaM9hn%2BpnghGtF7su8rFmLqxPX%2BITyP%2BswjYkBHmMKTU7xXohfPdDyPxcGdaz7vPOQkF69%2B6xhoO%2Fny0RKT8U%2BYmRofUDu6F51wRPFvPMFarTYGaie2nqg6uk%2FLbSFLI1zHNKO0ORln5cJkt%2FvrpZfjg73rZEMUQwOm2fVU4CnA47rP7H%2FoXywbW7GAisbXO%2BrU%2BJhcATlCBKUBwlkNlY2EZqc3Mj6g6QJfY0w9fM56mKOy1wBRh5%2FHgwWNJSEUU2dsSPMIzIm0fw6X24DbQvFJGmiGCOl5IB3Q25h0eJv24N87cy1Faf%2FDSKuwcE%2FGnPiVGejP7bxxNbq2WecSBB9AHbKG4bVdDomr%2BHyH9yuEtS0w%2BdLN6K5RQc%2FiECgk5GJXP3NoVLKBBHWbCnToR5KxnYHIgLCjMNCkCXOGsbPIpyHECPRz6FAKqxE6EbPooAsFlkwf5IvEsupNd9wAn%2FFnNUSw9yV9B9qHxF6M8nsTI9RwUfAFZZvHJs0xXlDxldxaED4OJ9OMm1weH8ksobuuk1N%2FiaMRFFAtWIuZC17MAJtTQ9ImQXG68P3h307zKuH2YbSuE15d3n0Q2JMvo5lJFLZPEkvbpYBpLFCiedFwcjnIdjxyCAaWG5wCMM%2FQnNQGOrEBfUzAN3baoPfhFg6rQDTrZVhebWyqOL2bHpMvrqR5KCx%2F8wHInU%2F0tfrQFJFPUReZw70eBV%2BtMl6trhZveywGzaQ%2BXWCg8750I0%2FvE2TJmuKBYxADRNQj6uRZ73zzVW8UNbZI4Hs%2FSK070vTxey%2FubZGfkt%2Bxj1%2FlLJyD9hOAce7Azg43K7VAjHdzofgegchn3CWg0Aa1pVs5dvsJPgXZzb5nyZek4OIvJAE5n%2BJipxDp&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UWH7ZQ6J2%2F20260820%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260820T165201Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=6f277c5e26cfd1b5217b3cfb2b116cecffe237e55795be3abe0b47cb747dfc1f 300w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/><\/li>\n<li>Use the drop-down menus to select the other table, and its primary key:<br \/>\n<img decoding=\"async\" class=\"alignnone size-full wp-image-310\" src=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125850\/DB4SQL-foreignkey-4.png\" alt=\"\" width=\"607\" height=\"87\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125850\/DB4SQL-foreignkey-4.png 607w, https:\/\/glow-prod-sh.s3.eu-west-1.amazonaws.com\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125850\/DB4SQL-foreignkey-4-300x43.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEMn%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIQDyTuSdHYwi6yyjVqwhBDeBQXvmHq4xYwwZUv%2BqHlQffgIgQogEL%2Ft%2BM4nUHcxwuomrAmEJFgYgAiyL4vA6foVaI4sqwgUIkf%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDCjZ5wNguqigR7Z%2F%2ByqWBfY9clQj6H1Q8gdc8vNXu%2Bu4ASWOYX0woG7nYi9eJy0YASAACe%2B9ghk8o0Kxi1P2hv1qlngZJlAZ6UXtNeCIIKaCV8XlOIdBD%2FJV5wUbhvqugkCTX1xrjhLrwXSqntbpZZzOUkRLeiu5UR2eBgHbyrdDnghzh7%2BhwnCewcYoRmQZ1JcZ8GVQ5CpqtJOT7wnDhVlDCX3wkVBSWU8Sb1qApRg7vhGRdZhgKsiXi0yE2mz4MZK7xGNxO34yunaM9hn%2BpnghGtF7su8rFmLqxPX%2BITyP%2BswjYkBHmMKTU7xXohfPdDyPxcGdaz7vPOQkF69%2B6xhoO%2Fny0RKT8U%2BYmRofUDu6F51wRPFvPMFarTYGaie2nqg6uk%2FLbSFLI1zHNKO0ORln5cJkt%2FvrpZfjg73rZEMUQwOm2fVU4CnA47rP7H%2FoXywbW7GAisbXO%2BrU%2BJhcATlCBKUBwlkNlY2EZqc3Mj6g6QJfY0w9fM56mKOy1wBRh5%2FHgwWNJSEUU2dsSPMIzIm0fw6X24DbQvFJGmiGCOl5IB3Q25h0eJv24N87cy1Faf%2FDSKuwcE%2FGnPiVGejP7bxxNbq2WecSBB9AHbKG4bVdDomr%2BHyH9yuEtS0w%2BdLN6K5RQc%2FiECgk5GJXP3NoVLKBBHWbCnToR5KxnYHIgLCjMNCkCXOGsbPIpyHECPRz6FAKqxE6EbPooAsFlkwf5IvEsupNd9wAn%2FFnNUSw9yV9B9qHxF6M8nsTI9RwUfAFZZvHJs0xXlDxldxaED4OJ9OMm1weH8ksobuuk1N%2FiaMRFFAtWIuZC17MAJtTQ9ImQXG68P3h307zKuH2YbSuE15d3n0Q2JMvo5lJFLZPEkvbpYBpLFCiedFwcjnIdjxyCAaWG5wCMM%2FQnNQGOrEBfUzAN3baoPfhFg6rQDTrZVhebWyqOL2bHpMvrqR5KCx%2F8wHInU%2F0tfrQFJFPUReZw70eBV%2BtMl6trhZveywGzaQ%2BXWCg8750I0%2FvE2TJmuKBYxADRNQj6uRZ73zzVW8UNbZI4Hs%2FSK070vTxey%2FubZGfkt%2Bxj1%2FlLJyD9hOAce7Azg43K7VAjHdzofgegchn3CWg0Aa1pVs5dvsJPgXZzb5nyZek4OIvJAE5n%2BJipxDp&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UWH7ZQ6J2%2F20260820%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260820T165201Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=54d73f21a175e052d82885baeccc56e53dd6e15734d0e734426d37d7b863dc87 300w\" sizes=\"(max-width: 607px) 100vw, 607px\" \/><\/li>\n<li>Click inside the grey &#8220;Foreign key clauses&#8230;&#8221; box, and press the Enter key<\/li>\n<li>Check the code in the bottom panel, and press the OK button<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Level &#8211; National 5+ Primary Key Every table should have a primary key &#8211; a unique identifier for each record. Primary keys are required (Not Null), and\u00a0must be unique Right-click on the Table name Select &#8220;Modify table&#8221; Tick the NN, PK and U options for the primary key Foreign Key A foreign key connects each record in a table to a record in another table. The other table must be<\/p>\n<p><a class=\"more-link\" href=\"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/creating-a-database\/primary-key\/\">Read More<\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"parent":262,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-195","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/pages\/195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/comments?post=195"}],"version-history":[{"count":10,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/pages\/195\/revisions"}],"predecessor-version":[{"id":407,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/pages\/195\/revisions\/407"}],"up":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/pages\/262"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputingsql\/wp-json\/wp\/v2\/media?parent=195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}