duplicate key

mysql "ON DUPLICATE KEY UPDATE" 语法 如果在INSERT语句末尾指定了ON DUPLICATE KEY UPDATE,并且插入行后会导致在一个UNIQUE索引或PRIMARY KEY中出现重复值,则在出现重复值的行执行UPDATE;如果不会导致唯一值列重复的问题,则插入新 ...

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  • If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a du...
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  • 摘要:[MySQL] ON DUPLICATE KEY用法 ... 在實務上我們為了保持資料表的內容不會重複 通常會設定一個或數個欄位作為Primary key 而現在有個需求是新...
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  • 這應該是 MySQL 特有的 SQL 語法,我在其他資料庫還沒看過類似的東西,但真的滿好用的。官方說明文件在此。 再來我直接用範例說明。假設有一個 table 名叫 login_t...
    MySQL 語法 – INSERT … ON DUPLICATE KEY UPDATE
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  • Description INSERT ... ON DUPLICATE KEY UPDATE is a MariaDB/MySQL extension to the INSERT ...
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  • mysql "ON DUPLICATE KEY UPDATE" 语法 如果在INSERT语句末尾指定了ON DUPLICATE KEY UPDATE,并且插入行...
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  • 雖然可以完成上面提到的任務, 但寫程式時就會較麻煩, MySQL 提供了 INSERT … ON DUPLICATE KEY UPDATE 語句, 可以一行就完成, 無需用 IF ...
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