我试图理解如何用不同的值更新多个行,但我就是不明白。解决方案无处不在,但对我来说,它似乎很难理解。
例如,3次更新为1个查询:
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read了一个例子,但我真的不知道如何进行查询。即:
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 condition..any概念中有多个条件,我不完全清楚如何进行查询?
发布于 2014-09-05 04:53:56
你可以这样做:
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。日期应使用本机日期和时间类型存储在数据库中。
发布于 2014-09-05 04:54:58
您可以使用CASE
语句来处理多个if/then方案:
UPDATE table_to_update
SET cod_user= CASE WHEN user_rol = 'student' THEN '622057'
WHEN user_rol = 'assistant' THEN '2913659'
WHEN user_rol = 'admin' THEN '6160230'
END
,date = '12082014'
WHERE user_rol IN ('student','assistant','admin')
AND cod_office = '17389551';
发布于 2016-12-11 15:43:57
update table_name
set cod_user =
CASE
WHEN user_rol = 'student' THEN '622057'
WHEN user_rol = 'assistant' THEN '2913659'
WHEN user_rol = 'admin' THEN '6160230'?
END,date = '12082014'
WHERE user_rol IN ('student','assistant','admin')
AND cod_office = '17389551';
https://stackoverflow.com/questions/25674737
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