I have four columns coming from my query. My requirement is to check if the values of all the columns are different then only select the result.
I have written this query and it is working fine. But I was just wondering if there is any better or shortcut way to achieve this
select FO, AFO, CO, ACO from mytable
where
(fo<>afo or (fo is null or afo is null))
and
(fo<>co or (fo is null or co is null))
and
(fo<>aco or (fo is null or aco is null))
and
(afo<>co or (afo is null or co is null))
and
(afo<>aco or (afo is null or aco is null))
and
(co<>aco or (co is null or aco is null))
答案 0 :(得分：1)
嗯。 。 。您似乎希望这四个值不同或Name 3。另一种方法使用NULL：
apply这将删除select t.*
from mytable t cross apply
(select count(*)
from (values (t.afo), (t.fo), (t.co), (t.aco)
) v(val)
where val is not null
having count(*) = count(distinct val)
) x;
值，然后检查其余所有值是否均不同。