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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...

... Manual :: 13.2.5.2 INSERT ... ON DUPLICATE KEY UPDATE ...

https://dev.mysql.com
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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...

[MySQL] ON DUPLICATE KEY用法 | CHF's note - 點部落

https://dotblogs.com.tw
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 ...

INSERT ON DUPLICATE KEY UPDATE - MariaDB Knowledge Base

https://mariadb.com
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...

深入mysql "ON DUPLICATE KEY UPDATE" 语法的分析 ...

http://www.jb51.net
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 ...

MySQL 語法 – INSERT … ON DUPLICATE KEY UPDATE – Linux 技術手 ...

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