問題描述

我試圖了解如何使用不同的值更新多行，但我不明白.解決方案無處不在，但在我看來很難理解.

I am trying to understand how to UPDATE multiple rows with different values and I just don't get it. The solution is everywhere but to me it looks difficult to understand.

例如，三個更新為 1 個查詢:

For instance, three updates into 1 query:

UPDATE table_users
SET cod_user = '622057'
    , date = '12082014'
WHERE user_rol = 'student'
    AND cod_office = '17389551'; 

UPDATE table_users
SET cod_user = '2913659'
    , date = '12082014'
WHERE user_rol = 'assistant'
    AND cod_office = '17389551'; 

UPDATE table_users
SET cod_user = '6160230'
    , date = '12082014'
WHERE user_rol = 'admin'
    AND cod_office = '17389551'; 

我 閱讀 一個例子，但我真的不明白如何進行查詢.即:

I read an example, but I really don't understand how to make the query. i.e:

UPDATE table_to_update
SET cod_user= IF(cod_office = '17389551','622057','2913659','6160230')
    ,date = IF(cod_office = '17389551','12082014')
WHERE ?? IN (??) ;

如果 WHERE 和 IF 條件中有多個條件，我不完全清楚如何進行查詢..有什么想法嗎?

I'm not entirely clear how to do the query if there are multiple condition in the WHERE and in the IF condition..any ideas?

推薦答案

你可以這樣做:

UPDATE table_users
    SET cod_user = (case when user_role = 'student' then '622057'
                         when user_role = 'assistant' then '2913659'
                         when user_role = 'admin' then '6160230'
                    end),
        date = '12082014'
    WHERE user_role in ('student', 'assistant', 'admin') AND
          cod_office = '17389551';

我不明白你的日期格式.日期應使用本機日期和時間類型存儲在數據庫中.

I don't understand your date format. Dates should be stored in the database using native date and time types.

這篇關于MySQL - 在一個查詢中更新具有不同值的多行的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！