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    MySQL怎么更新存在主鍵的數據

    小億
    82
    2024-01-03 15:25:05
    欄目: 編程技術

    要更新MySQL表中已存在的數據,需要使用UPDATE語句。如果表中有主鍵,則可以使用主鍵來定位要更新的數據。

    以下是更新已存在數據的基本語法:

    UPDATE table_name
    SET column1 = value1, column2 = value2, ...
    WHERE condition;
    

    其中,table_name是要更新的表名,column1、column2等是要更新的列名,value1、value2等是要更新的新值,condition是用于定位要更新的數據的條件。

    例如,假設有一個名為users的表,其中有id、name和age三列,id是主鍵?,F在要將id為1的用戶的名字和年齡更新為"John"和25,可以使用以下語句:

    UPDATE users
    SET name = 'John', age = 25
    WHERE id = 1;
    

    0
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