SQL条件控制(case when...then...else...end)

1:
select ByeTime,case when len(ByeTime)>0 then str(DATEDIFF(day,ComeInTime,ByeTime)) else DATEDIFF(day,ComeInTime,getdate()) end as test
from myUser where DelFlag='0' and UserID='cq'
2:
select ByeTime,case when len(ByeTime)>0 then str(DATEDIFF(day,ComeInTime,ByeTime))+'(已离职)' end as test
from myUser where DelFlag='0' and UserID='cq'
3:
select ByeTime,case when len(ByeTime)>0 then str(DATEDIFF(day,ComeInTime,ByeTime))+'(已离职)'
else str(DATEDIFF(day,ComeInTime,getdate())) end as test
from myUser where DelFlag='0' and UserID='cq'

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