{"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 loading=\"lazy\" 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=IQoJb3JpZ2luX2VjEOz%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIHOgkDlnsmdNPb1YynRD8AdKgIaYx%2BUxg5hIrTEY7cdKAiEA2d9TOElVENaM0o7QFgXTXtyJogEuHd65%2FYyGeb48KR8qwQUItf%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDLtOIDXu3Iw7gA52fCqVBVbh0ABBjIwrWoZ9Np4pPhqjVQXk6OYaxxSCsEdO4iEbdC21Y92A1XgwhINAdbwbRRwD0w8zu6GAtSvQwHuYK9Ugig%2FtGp15YiX%2BcreotWHnjU1QU8zfJAnsjZn74R24l%2Fpw1ywMwzINkEcGeCl2nUmw2wATa%2Fyd%2FaEqVJJv%2FXEP1CiWSm45BDa%2FsbMjCbA%2BywuT9%2FwYy%2FyfAM21Lqft9SpZIXCUUMBokWIILFeKWCDCbaFvoYO1hu1A2S%2F%2FMXtad1XHfJquBotH5XHareTb9IteLe55i51FnkZGlW2lg0kF5jIXxcuizJ04thO91nAd7RGRYDsUPFv8YrAHS%2BhJRckWUAvEp7%2BD3P0B%2Bv4tUvPqRgfkGdzOjBE6McyrXX4%2FNKdTcWeSX8mI%2F6BRuC%2BVJJy90kTBP5%2FRnKDVg7bNMo9oT7XBKrFoqiUo%2BU%2FBOvxtMVd%2BZ%2FkjjrKmpDsF%2BVe0suK4u%2Bs%2BnZLcuu5ITXFt4mm0DTbhU6hK893CpKx0xrbN88idgiX1QdgYErvS%2BEO309p7yFBNAubbnicnN8fMeXv4B4E2jdJi23AuTe0W4E9LAFvPxIXSiyr2pxDkOG7IL0e7AAH3hMY%2FYoUyYClwJLLgG3SoXB8B8byTgijnShhTQD6VeAUrWTwMU85bismmTB7%2BT%2FHEmTgszZsH95elHFq0os%2FlItsCUkxLGsAq%2FOKCrXEefaimWYl1FvbC0Yrq9woxBfEwslgMGuaxhchQ%2BkP8MarBwysRvRM%2Fo6c1G6MO9yev%2BGhWiVYnzy5aS81Z08WQF0BnF1%2F%2FEfQNKl5tnqxkIr6aS6Bb4tLTkcZskGJpXVfJFdMZ91lWkaJU%2FEzInePg66Bw1h%2BkasCjrOU8yMm8BpIn9nAw%2BozJzgY6sQFrfQxivaDxUPHDQsXY2AzfjhasgSTSdIDnoSKVzTfuJD02TMTjQ4C4ayWsuH40BO3pMFhcRT3gAfB3Z3EtoIfWj7YeP82q9pmVvQg8q%2BudeWTUlGLvR8L6xE8wFgvQGrDRZwHWte94YwYYc%2B4CddOOSXm9TdJU%2BkM8mYOt900EU5nMDns7gCkcNZkhJx%2Bt37I6hS1ZN%2BqTDSC85sgfCRst8%2FcM22naW0Npt6gGAWGdNyI%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UVOTHKO2M%2F20260405%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260405T115526Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=84eb802826f9808a1e219bb3a3f57b02a573d81dadfb004350f27b397dc34e44 300w\" sizes=\"auto, (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 loading=\"lazy\" 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=\"auto, (max-width: 334px) 100vw, 334px\" \/><\/li>\n<li>Widen the table so you can see the Foreign Key column<br \/>\n<img loading=\"lazy\" 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=\"auto, (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 loading=\"lazy\" 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=IQoJb3JpZ2luX2VjEOz%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIHOgkDlnsmdNPb1YynRD8AdKgIaYx%2BUxg5hIrTEY7cdKAiEA2d9TOElVENaM0o7QFgXTXtyJogEuHd65%2FYyGeb48KR8qwQUItf%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDLtOIDXu3Iw7gA52fCqVBVbh0ABBjIwrWoZ9Np4pPhqjVQXk6OYaxxSCsEdO4iEbdC21Y92A1XgwhINAdbwbRRwD0w8zu6GAtSvQwHuYK9Ugig%2FtGp15YiX%2BcreotWHnjU1QU8zfJAnsjZn74R24l%2Fpw1ywMwzINkEcGeCl2nUmw2wATa%2Fyd%2FaEqVJJv%2FXEP1CiWSm45BDa%2FsbMjCbA%2BywuT9%2FwYy%2FyfAM21Lqft9SpZIXCUUMBokWIILFeKWCDCbaFvoYO1hu1A2S%2F%2FMXtad1XHfJquBotH5XHareTb9IteLe55i51FnkZGlW2lg0kF5jIXxcuizJ04thO91nAd7RGRYDsUPFv8YrAHS%2BhJRckWUAvEp7%2BD3P0B%2Bv4tUvPqRgfkGdzOjBE6McyrXX4%2FNKdTcWeSX8mI%2F6BRuC%2BVJJy90kTBP5%2FRnKDVg7bNMo9oT7XBKrFoqiUo%2BU%2FBOvxtMVd%2BZ%2FkjjrKmpDsF%2BVe0suK4u%2Bs%2BnZLcuu5ITXFt4mm0DTbhU6hK893CpKx0xrbN88idgiX1QdgYErvS%2BEO309p7yFBNAubbnicnN8fMeXv4B4E2jdJi23AuTe0W4E9LAFvPxIXSiyr2pxDkOG7IL0e7AAH3hMY%2FYoUyYClwJLLgG3SoXB8B8byTgijnShhTQD6VeAUrWTwMU85bismmTB7%2BT%2FHEmTgszZsH95elHFq0os%2FlItsCUkxLGsAq%2FOKCrXEefaimWYl1FvbC0Yrq9woxBfEwslgMGuaxhchQ%2BkP8MarBwysRvRM%2Fo6c1G6MO9yev%2BGhWiVYnzy5aS81Z08WQF0BnF1%2F%2FEfQNKl5tnqxkIr6aS6Bb4tLTkcZskGJpXVfJFdMZ91lWkaJU%2FEzInePg66Bw1h%2BkasCjrOU8yMm8BpIn9nAw%2BozJzgY6sQFrfQxivaDxUPHDQsXY2AzfjhasgSTSdIDnoSKVzTfuJD02TMTjQ4C4ayWsuH40BO3pMFhcRT3gAfB3Z3EtoIfWj7YeP82q9pmVvQg8q%2BudeWTUlGLvR8L6xE8wFgvQGrDRZwHWte94YwYYc%2B4CddOOSXm9TdJU%2BkM8mYOt900EU5nMDns7gCkcNZkhJx%2Bt37I6hS1ZN%2BqTDSC85sgfCRst8%2FcM22naW0Npt6gGAWGdNyI%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UVOTHKO2M%2F20260405%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260405T115526Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=29842899170a86b0f5c0367bd91b703da17b9401751531137fde9f226834ebb0 300w\" sizes=\"auto, (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 loading=\"lazy\" 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=IQoJb3JpZ2luX2VjEOz%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIHOgkDlnsmdNPb1YynRD8AdKgIaYx%2BUxg5hIrTEY7cdKAiEA2d9TOElVENaM0o7QFgXTXtyJogEuHd65%2FYyGeb48KR8qwQUItf%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDLtOIDXu3Iw7gA52fCqVBVbh0ABBjIwrWoZ9Np4pPhqjVQXk6OYaxxSCsEdO4iEbdC21Y92A1XgwhINAdbwbRRwD0w8zu6GAtSvQwHuYK9Ugig%2FtGp15YiX%2BcreotWHnjU1QU8zfJAnsjZn74R24l%2Fpw1ywMwzINkEcGeCl2nUmw2wATa%2Fyd%2FaEqVJJv%2FXEP1CiWSm45BDa%2FsbMjCbA%2BywuT9%2FwYy%2FyfAM21Lqft9SpZIXCUUMBokWIILFeKWCDCbaFvoYO1hu1A2S%2F%2FMXtad1XHfJquBotH5XHareTb9IteLe55i51FnkZGlW2lg0kF5jIXxcuizJ04thO91nAd7RGRYDsUPFv8YrAHS%2BhJRckWUAvEp7%2BD3P0B%2Bv4tUvPqRgfkGdzOjBE6McyrXX4%2FNKdTcWeSX8mI%2F6BRuC%2BVJJy90kTBP5%2FRnKDVg7bNMo9oT7XBKrFoqiUo%2BU%2FBOvxtMVd%2BZ%2FkjjrKmpDsF%2BVe0suK4u%2Bs%2BnZLcuu5ITXFt4mm0DTbhU6hK893CpKx0xrbN88idgiX1QdgYErvS%2BEO309p7yFBNAubbnicnN8fMeXv4B4E2jdJi23AuTe0W4E9LAFvPxIXSiyr2pxDkOG7IL0e7AAH3hMY%2FYoUyYClwJLLgG3SoXB8B8byTgijnShhTQD6VeAUrWTwMU85bismmTB7%2BT%2FHEmTgszZsH95elHFq0os%2FlItsCUkxLGsAq%2FOKCrXEefaimWYl1FvbC0Yrq9woxBfEwslgMGuaxhchQ%2BkP8MarBwysRvRM%2Fo6c1G6MO9yev%2BGhWiVYnzy5aS81Z08WQF0BnF1%2F%2FEfQNKl5tnqxkIr6aS6Bb4tLTkcZskGJpXVfJFdMZ91lWkaJU%2FEzInePg66Bw1h%2BkasCjrOU8yMm8BpIn9nAw%2BozJzgY6sQFrfQxivaDxUPHDQsXY2AzfjhasgSTSdIDnoSKVzTfuJD02TMTjQ4C4ayWsuH40BO3pMFhcRT3gAfB3Z3EtoIfWj7YeP82q9pmVvQg8q%2BudeWTUlGLvR8L6xE8wFgvQGrDRZwHWte94YwYYc%2B4CddOOSXm9TdJU%2BkM8mYOt900EU5nMDns7gCkcNZkhJx%2Bt37I6hS1ZN%2BqTDSC85sgfCRst8%2FcM22naW0Npt6gGAWGdNyI%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UVOTHKO2M%2F20260405%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260405T115526Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=59ca3374769ae293c7eb120a555908fe70eb0a0eff115e639215eff84f523f3c 300w\" sizes=\"auto, (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}]}}