我试图理解如何用不同的值更新多行,但我不明白.解决方案无处不在,但对我来说,它看起来很难理解.
例如,在一个查询中进行三次更新:
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';
我举了一个例子,但我真的不明白如何进行查询.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条件中有多个条件,我不完全清楚如何进行查询..有什么 idea 吗?