{"id":84,"date":"2022-10-04T13:25:57","date_gmt":"2022-10-04T13:25:57","guid":{"rendered":"https:\/\/jassweb.com\/new22\/solved-sql-update-statement-for-unique-field\/"},"modified":"2022-10-04T13:25:57","modified_gmt":"2022-10-04T13:25:57","slug":"solved-sql-update-statement-for-unique-field-2","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-sql-update-statement-for-unique-field-2\/","title":{"rendered":"[Solved] Sql update statement for unique field"},"content":{"rendered":"

The SQL UPDATE statement is a powerful tool for updating data in a database. It can be used to update a single field or multiple fields in a table. When updating a unique field, it is important to ensure that the value being updated is unique and does not already exist in the table. This article will discuss how to use the SQL UPDATE statement to update a unique field in a table. It will also provide examples of how to use the statement to update a unique field.<\/p>\n

UPDATE table_name
\nSET field_name = new_value
\nWHERE field_name = old_value
\nAND id = unique_id;
\n[ad_1]
\n<\/p>\n

\n

If you update (or insert into table), and the new inserted\/updated col1 value is already being used on some row, your query should fail with unique constraint violation error<\/em>.<\/p>\n

Make your application handle this error\/exception properly and there\u2019s really no need to check the existence of this value before the update\/insert. The less queries your application makes the better it is for everyone\u2026<\/p>\n

However, I\u2019d like to draw your attention to the following:
You already seem to have an ID column in your table. If it\u2019s a Primary Key column, then it\u2019s definitely unique too. Now consider, if you really need to have two unique key columns in the table. If your application logic is based on the unique values in the col1 column, you can actually drop the ID column and turn col1 into Primary Key instead ?<\/p>\n<\/div>\n

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The SQL UPDATE statement is a powerful tool for updating data in a database. It can be used to update a single field or multiple fields in a table. When updating a unique field, it is important to ensure that the value being updated is unique and does not already exist in the table. This … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[340,339],"class_list":["post-84","post","type-post","status-publish","format-standard","hentry","category-solved","tag-mysql","tag-php"],"yoast_head":"\n[Solved] Sql update statement for unique field - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-sql-update-statement-for-unique-field-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Sql update statement for unique field - JassWeb\" \/>\n<meta property=\"og:description\" content=\"The SQL UPDATE statement is a powerful tool for updating data in a database. 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