{"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=IQoJb3JpZ2luX2VjEHYaCWV1LXdlc3QtMSJHMEUCIQCiRVw79tAbqXdf6je%2F9Hm6Qf0St%2BppDI5y9qLpE%2BQUhQIgajLFSbNn%2FNB4PgTR%2BM0DwbgyQVeRHix6BJTC6FvQus4quQUIPxAFGgwyNzM1NzAxOTU0MzMiDH%2Bm2%2BJmFw%2FJO4ryQSqWBfP2m8rJOeHNWvG2YUa0WIYnh2fhLslEaufbEEDOab4ylH2Nz0eNEustJwpHvk1OWnz7Wm%2BAzd%2FhiDHeUWbPw8iht9UDtxeu8fp2VoN0l1JFaLqkQBFx4c2iZf8EIBBpl02xSocFxBnYPiBRYDJeOHn0LCj%2B5MaGaJ51IW3kJqP%2Fz%2Bw9Q3wn%2FIAicEul3aeEFi1hmkDz8E7cZtAiKSx2298UgHVpw4PslFr5P%2FtuiUQcu8tbMpNtaMojnP1FCJsWa9cyz7kG%2BOTQcbDC6ufSUl2v%2BCM%2Bq5QxYFIKKH3pe8c0aiWtTeS9I9H5%2BU24HNIiQKOnY118%2BLOSADY9z7D4EF6r7hnXKTJ5b0wEJEXjK4dUB%2BVgpeOUS8MNIiVpEpu%2BWU%2F9uTEAPN9ps35qia082sfiV8uoGsTMSclD6%2FkYF3HTDw2J9%2FEDAS01MbNoMBsm9icOQyUyAnGyUVEu%2FGAtA2QhzCKFivmAcvHV4wAUpID7nz8qrT74k3NitPGsttCWLF%2BvTj6IcbNa5gqiKchggEkNGKEqQ9Dhu%2FjZ7mAigBxkco8rq4qGdo90iaiuQ6gKDSVCKCKLq5vpsAUsVMAZGot2AsmMIcKoW1Zi6jdTmv2tRHWHkjXx3kAYHOgk2KSdP5kTph9fgLZkv2i6B1JUwd9m93sngr%2FwbGtheOoMiZV5maJm8TgbA%2FGOJ8k0ImvTqUuQF%2B6M4l8dZmRdDUv0Bh%2FoX%2FnQWfqp%2BgSYryAnL0R60BTlyq6ll0B2Czm%2B4AXJPebKjlIVs5kCToK5Hc2WbsZiqp9h8uqZvyzwtP6Zh98jjR3pS8aadvsgg9C8A2CyG2tI1qYix9NyrgSllW%2FZsCeIbGVH6yiOF81oWJpkG%2BnZ9iAgcJ%2BoMJ%2F1uNEGOrEBC4WP9hbNVZONR8lK4I1tqxR3qvcYrZ%2FX045wYTmrrl9By5IyDu36xlJX9oXqpkblJCubRHiD3CnHhpF4cdiirOQRjqbdy6H%2Bvo5MJ2BI1IsXCAExKl8K%2B3%2FGX120i3tCtFEs%2FYzAhcBD%2BWXOOR4okQt20Aw5ymVV1TMzGK5hH%2FL%2BGKEEcD76IaFnEFJRVWu63lQkRvHmwLlFhoBRgC8LMpCMFUMo%2FjRXBIUY2ybsScis&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U5L3HR2JT%2F20260614%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260614T052726Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=e489027982a65b1126a7b305f218427cb9349db20024217ff623a9e29868839f 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, https:\/\/glow-prod-sh.s3.eu-west-1.amazonaws.com\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125204\/DB4SQL-foreignkey-1-300x144.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHYaCWV1LXdlc3QtMSJHMEUCIQCiRVw79tAbqXdf6je%2F9Hm6Qf0St%2BppDI5y9qLpE%2BQUhQIgajLFSbNn%2FNB4PgTR%2BM0DwbgyQVeRHix6BJTC6FvQus4quQUIPxAFGgwyNzM1NzAxOTU0MzMiDH%2Bm2%2BJmFw%2FJO4ryQSqWBfP2m8rJOeHNWvG2YUa0WIYnh2fhLslEaufbEEDOab4ylH2Nz0eNEustJwpHvk1OWnz7Wm%2BAzd%2FhiDHeUWbPw8iht9UDtxeu8fp2VoN0l1JFaLqkQBFx4c2iZf8EIBBpl02xSocFxBnYPiBRYDJeOHn0LCj%2B5MaGaJ51IW3kJqP%2Fz%2Bw9Q3wn%2FIAicEul3aeEFi1hmkDz8E7cZtAiKSx2298UgHVpw4PslFr5P%2FtuiUQcu8tbMpNtaMojnP1FCJsWa9cyz7kG%2BOTQcbDC6ufSUl2v%2BCM%2Bq5QxYFIKKH3pe8c0aiWtTeS9I9H5%2BU24HNIiQKOnY118%2BLOSADY9z7D4EF6r7hnXKTJ5b0wEJEXjK4dUB%2BVgpeOUS8MNIiVpEpu%2BWU%2F9uTEAPN9ps35qia082sfiV8uoGsTMSclD6%2FkYF3HTDw2J9%2FEDAS01MbNoMBsm9icOQyUyAnGyUVEu%2FGAtA2QhzCKFivmAcvHV4wAUpID7nz8qrT74k3NitPGsttCWLF%2BvTj6IcbNa5gqiKchggEkNGKEqQ9Dhu%2FjZ7mAigBxkco8rq4qGdo90iaiuQ6gKDSVCKCKLq5vpsAUsVMAZGot2AsmMIcKoW1Zi6jdTmv2tRHWHkjXx3kAYHOgk2KSdP5kTph9fgLZkv2i6B1JUwd9m93sngr%2FwbGtheOoMiZV5maJm8TgbA%2FGOJ8k0ImvTqUuQF%2B6M4l8dZmRdDUv0Bh%2FoX%2FnQWfqp%2BgSYryAnL0R60BTlyq6ll0B2Czm%2B4AXJPebKjlIVs5kCToK5Hc2WbsZiqp9h8uqZvyzwtP6Zh98jjR3pS8aadvsgg9C8A2CyG2tI1qYix9NyrgSllW%2FZsCeIbGVH6yiOF81oWJpkG%2BnZ9iAgcJ%2BoMJ%2F1uNEGOrEBC4WP9hbNVZONR8lK4I1tqxR3qvcYrZ%2FX045wYTmrrl9By5IyDu36xlJX9oXqpkblJCubRHiD3CnHhpF4cdiirOQRjqbdy6H%2Bvo5MJ2BI1IsXCAExKl8K%2B3%2FGX120i3tCtFEs%2FYzAhcBD%2BWXOOR4okQt20Aw5ymVV1TMzGK5hH%2FL%2BGKEEcD76IaFnEFJRVWu63lQkRvHmwLlFhoBRgC8LMpCMFUMo%2FjRXBIUY2ybsScis&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U5L3HR2JT%2F20260614%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260614T052726Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=51f530626fc73f99a814a771d1df26d00b1f9ee128d32e8012ce39f25eb2ff28 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, https:\/\/glow-prod-sh.s3.eu-west-1.amazonaws.com\/sh\/public\/ahscomputingsql\/uploads\/sites\/3269\/2021\/03\/24125203\/DB4SQL-foreignkey-2-300x97.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHYaCWV1LXdlc3QtMSJHMEUCIQCiRVw79tAbqXdf6je%2F9Hm6Qf0St%2BppDI5y9qLpE%2BQUhQIgajLFSbNn%2FNB4PgTR%2BM0DwbgyQVeRHix6BJTC6FvQus4quQUIPxAFGgwyNzM1NzAxOTU0MzMiDH%2Bm2%2BJmFw%2FJO4ryQSqWBfP2m8rJOeHNWvG2YUa0WIYnh2fhLslEaufbEEDOab4ylH2Nz0eNEustJwpHvk1OWnz7Wm%2BAzd%2FhiDHeUWbPw8iht9UDtxeu8fp2VoN0l1JFaLqkQBFx4c2iZf8EIBBpl02xSocFxBnYPiBRYDJeOHn0LCj%2B5MaGaJ51IW3kJqP%2Fz%2Bw9Q3wn%2FIAicEul3aeEFi1hmkDz8E7cZtAiKSx2298UgHVpw4PslFr5P%2FtuiUQcu8tbMpNtaMojnP1FCJsWa9cyz7kG%2BOTQcbDC6ufSUl2v%2BCM%2Bq5QxYFIKKH3pe8c0aiWtTeS9I9H5%2BU24HNIiQKOnY118%2BLOSADY9z7D4EF6r7hnXKTJ5b0wEJEXjK4dUB%2BVgpeOUS8MNIiVpEpu%2BWU%2F9uTEAPN9ps35qia082sfiV8uoGsTMSclD6%2FkYF3HTDw2J9%2FEDAS01MbNoMBsm9icOQyUyAnGyUVEu%2FGAtA2QhzCKFivmAcvHV4wAUpID7nz8qrT74k3NitPGsttCWLF%2BvTj6IcbNa5gqiKchggEkNGKEqQ9Dhu%2FjZ7mAigBxkco8rq4qGdo90iaiuQ6gKDSVCKCKLq5vpsAUsVMAZGot2AsmMIcKoW1Zi6jdTmv2tRHWHkjXx3kAYHOgk2KSdP5kTph9fgLZkv2i6B1JUwd9m93sngr%2FwbGtheOoMiZV5maJm8TgbA%2FGOJ8k0ImvTqUuQF%2B6M4l8dZmRdDUv0Bh%2FoX%2FnQWfqp%2BgSYryAnL0R60BTlyq6ll0B2Czm%2B4AXJPebKjlIVs5kCToK5Hc2WbsZiqp9h8uqZvyzwtP6Zh98jjR3pS8aadvsgg9C8A2CyG2tI1qYix9NyrgSllW%2FZsCeIbGVH6yiOF81oWJpkG%2BnZ9iAgcJ%2BoMJ%2F1uNEGOrEBC4WP9hbNVZONR8lK4I1tqxR3qvcYrZ%2FX045wYTmrrl9By5IyDu36xlJX9oXqpkblJCubRHiD3CnHhpF4cdiirOQRjqbdy6H%2Bvo5MJ2BI1IsXCAExKl8K%2B3%2FGX120i3tCtFEs%2FYzAhcBD%2BWXOOR4okQt20Aw5ymVV1TMzGK5hH%2FL%2BGKEEcD76IaFnEFJRVWu63lQkRvHmwLlFhoBRgC8LMpCMFUMo%2FjRXBIUY2ybsScis&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U5L3HR2JT%2F20260614%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260614T052726Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=cecbb97a2b49e83dd6cd6cf2afaa85ddd9291b01eab676c9309affdb909c2eea 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=IQoJb3JpZ2luX2VjEHYaCWV1LXdlc3QtMSJHMEUCIQCiRVw79tAbqXdf6je%2F9Hm6Qf0St%2BppDI5y9qLpE%2BQUhQIgajLFSbNn%2FNB4PgTR%2BM0DwbgyQVeRHix6BJTC6FvQus4quQUIPxAFGgwyNzM1NzAxOTU0MzMiDH%2Bm2%2BJmFw%2FJO4ryQSqWBfP2m8rJOeHNWvG2YUa0WIYnh2fhLslEaufbEEDOab4ylH2Nz0eNEustJwpHvk1OWnz7Wm%2BAzd%2FhiDHeUWbPw8iht9UDtxeu8fp2VoN0l1JFaLqkQBFx4c2iZf8EIBBpl02xSocFxBnYPiBRYDJeOHn0LCj%2B5MaGaJ51IW3kJqP%2Fz%2Bw9Q3wn%2FIAicEul3aeEFi1hmkDz8E7cZtAiKSx2298UgHVpw4PslFr5P%2FtuiUQcu8tbMpNtaMojnP1FCJsWa9cyz7kG%2BOTQcbDC6ufSUl2v%2BCM%2Bq5QxYFIKKH3pe8c0aiWtTeS9I9H5%2BU24HNIiQKOnY118%2BLOSADY9z7D4EF6r7hnXKTJ5b0wEJEXjK4dUB%2BVgpeOUS8MNIiVpEpu%2BWU%2F9uTEAPN9ps35qia082sfiV8uoGsTMSclD6%2FkYF3HTDw2J9%2FEDAS01MbNoMBsm9icOQyUyAnGyUVEu%2FGAtA2QhzCKFivmAcvHV4wAUpID7nz8qrT74k3NitPGsttCWLF%2BvTj6IcbNa5gqiKchggEkNGKEqQ9Dhu%2FjZ7mAigBxkco8rq4qGdo90iaiuQ6gKDSVCKCKLq5vpsAUsVMAZGot2AsmMIcKoW1Zi6jdTmv2tRHWHkjXx3kAYHOgk2KSdP5kTph9fgLZkv2i6B1JUwd9m93sngr%2FwbGtheOoMiZV5maJm8TgbA%2FGOJ8k0ImvTqUuQF%2B6M4l8dZmRdDUv0Bh%2FoX%2FnQWfqp%2BgSYryAnL0R60BTlyq6ll0B2Czm%2B4AXJPebKjlIVs5kCToK5Hc2WbsZiqp9h8uqZvyzwtP6Zh98jjR3pS8aadvsgg9C8A2CyG2tI1qYix9NyrgSllW%2FZsCeIbGVH6yiOF81oWJpkG%2BnZ9iAgcJ%2BoMJ%2F1uNEGOrEBC4WP9hbNVZONR8lK4I1tqxR3qvcYrZ%2FX045wYTmrrl9By5IyDu36xlJX9oXqpkblJCubRHiD3CnHhpF4cdiirOQRjqbdy6H%2Bvo5MJ2BI1IsXCAExKl8K%2B3%2FGX120i3tCtFEs%2FYzAhcBD%2BWXOOR4okQt20Aw5ymVV1TMzGK5hH%2FL%2BGKEEcD76IaFnEFJRVWu63lQkRvHmwLlFhoBRgC8LMpCMFUMo%2FjRXBIUY2ybsScis&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U5L3HR2JT%2F20260614%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260614T052726Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=a8e3226620a3d65768def806b4a51a6e00f32121b82debcdd8ae9d5876a5f413 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=IQoJb3JpZ2luX2VjEHYaCWV1LXdlc3QtMSJHMEUCIQCiRVw79tAbqXdf6je%2F9Hm6Qf0St%2BppDI5y9qLpE%2BQUhQIgajLFSbNn%2FNB4PgTR%2BM0DwbgyQVeRHix6BJTC6FvQus4quQUIPxAFGgwyNzM1NzAxOTU0MzMiDH%2Bm2%2BJmFw%2FJO4ryQSqWBfP2m8rJOeHNWvG2YUa0WIYnh2fhLslEaufbEEDOab4ylH2Nz0eNEustJwpHvk1OWnz7Wm%2BAzd%2FhiDHeUWbPw8iht9UDtxeu8fp2VoN0l1JFaLqkQBFx4c2iZf8EIBBpl02xSocFxBnYPiBRYDJeOHn0LCj%2B5MaGaJ51IW3kJqP%2Fz%2Bw9Q3wn%2FIAicEul3aeEFi1hmkDz8E7cZtAiKSx2298UgHVpw4PslFr5P%2FtuiUQcu8tbMpNtaMojnP1FCJsWa9cyz7kG%2BOTQcbDC6ufSUl2v%2BCM%2Bq5QxYFIKKH3pe8c0aiWtTeS9I9H5%2BU24HNIiQKOnY118%2BLOSADY9z7D4EF6r7hnXKTJ5b0wEJEXjK4dUB%2BVgpeOUS8MNIiVpEpu%2BWU%2F9uTEAPN9ps35qia082sfiV8uoGsTMSclD6%2FkYF3HTDw2J9%2FEDAS01MbNoMBsm9icOQyUyAnGyUVEu%2FGAtA2QhzCKFivmAcvHV4wAUpID7nz8qrT74k3NitPGsttCWLF%2BvTj6IcbNa5gqiKchggEkNGKEqQ9Dhu%2FjZ7mAigBxkco8rq4qGdo90iaiuQ6gKDSVCKCKLq5vpsAUsVMAZGot2AsmMIcKoW1Zi6jdTmv2tRHWHkjXx3kAYHOgk2KSdP5kTph9fgLZkv2i6B1JUwd9m93sngr%2FwbGtheOoMiZV5maJm8TgbA%2FGOJ8k0ImvTqUuQF%2B6M4l8dZmRdDUv0Bh%2FoX%2FnQWfqp%2BgSYryAnL0R60BTlyq6ll0B2Czm%2B4AXJPebKjlIVs5kCToK5Hc2WbsZiqp9h8uqZvyzwtP6Zh98jjR3pS8aadvsgg9C8A2CyG2tI1qYix9NyrgSllW%2FZsCeIbGVH6yiOF81oWJpkG%2BnZ9iAgcJ%2BoMJ%2F1uNEGOrEBC4WP9hbNVZONR8lK4I1tqxR3qvcYrZ%2FX045wYTmrrl9By5IyDu36xlJX9oXqpkblJCubRHiD3CnHhpF4cdiirOQRjqbdy6H%2Bvo5MJ2BI1IsXCAExKl8K%2B3%2FGX120i3tCtFEs%2FYzAhcBD%2BWXOOR4okQt20Aw5ymVV1TMzGK5hH%2FL%2BGKEEcD76IaFnEFJRVWu63lQkRvHmwLlFhoBRgC8LMpCMFUMo%2FjRXBIUY2ybsScis&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U5L3HR2JT%2F20260614%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260614T052726Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=c1d0d178ede372441de5c518549d3d51a2c8aa326d31ce8a05556b78b7a5de03 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}]}}