MySQL在where后面使用case when
在MySQL中,在where后面使用case when的说明报错语句select *from A, Bwhere B.name inCASEwhen A.id = 0 then ('aaa', 'bbb')when A.id = 1 then ('bbb', 'ccc')when A.id = 2 then ('ccc', 'ddd')END正确写法:将B.name in 放到CASE END 中
在MySQL中,在where后面使用case when的说明
报错语句
select *
from A, B
where B.name in
CASE
when A.id = 0 then ('aaa', 'bbb')
when A.id = 1 then ('bbb', 'ccc')
when A.id = 2 then ('ccc', 'ddd')
END
正确写法:将B.name in 放到CASE END 中
select *
from A, B
where
CASE
when A.id = 0 then B.name in ('aaa', 'bbb')
when A.id = 1 then B.name in ('bbb', 'ccc')
when A.id = 2 then B.name in ('ccc', 'ddd')
END
补充:当使用 B.name = 时,将不会出现以上问题,也就是如下写法也正确
select *
from A, B
where B.name =
CASE
when A.id = 0 then 'aaa'
when A.id = 1 then 'bbb'
when A.id = 2 then 'ccc'
END
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