sql Transact for good Sample
(select *,case when left(a.ww,2)='po' then ('MI-'+a.ww) else a.ww end as new_ww from A) A left join B
on A.new_ww=B.xx
和
select * from a left outer join b on (case when left(a.ww,2)='po' then ('MI-'+a.ww) else a.ww end)=b.xx
我都測試正常呀?是不是語法或者是欄位名寫錯了?
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