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select * from a,b where a.id=b.id and charindex('a',a.nm)>0
select * from a inner join b on a.id=b.id where charindex('a',a.nm)>0
select * from DataBaseA.DBO.ATable A inner join DataBaseB.dbo.BTable B on A.UserID = B.UserID
where instr(A.dd,'公司')>0