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if not exists(select 1 from userInfo where userid=@uid and userPwd=@pwd) or not exists(select 1 from groupMember where userid=@uid)
return
insert操作语句....
if not exists(select 1 from userInfo ui join groupMember gm on gm.userid=ui.userid where ui.userid=@uid and ui.userPwd=@pwd)
return
insert操作语句....