sql不常用函数总结以及事务，增加，删除触发器(sql不重复计数函数)

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sql不常用函数总结以及事务，增加，删除触发器 distinct 删除重复行 declare @x 申明一个变量 convert(varchar(),tscore.tenglish) 类型转换 cast(xx as varchar()) 类型转换 www.gimoo.net ====================================================== 情况 case when xxx then xx when xxxx then xxxxx else end ======================================================= while xxx begin xxxxxx end www.gimoo.net 事务 =================================================== begin tran declare @sum int = 0 update bank set balance=balance- where cid='' set @sum=@sum+@@error update bank set balance=balance + where cid='' set @sum=@sum+@@error if @sum<>0 begin rollback print '回滚！' end else begin --提交事务 commit tran print '提交了！' end =================================================== begin tran www.gimoo.net begin try declare @sum int = 0 update bank set balance=balance- where cid='' set @sum=@sum+@@error update bank set balance=balance + where cid='' set @sum=@sum+@@error commit end try begin catch rollback end catch ===================================================== declare @halfCount int= ceiling(@count/2.0) 向上增加时触发器 ========================================= create trigger tri_TblClass_insert_after on TblClass after insert as begin declare @id int declare @name varchar() declare @desc varchar() select @id=tclassId,@name=tclassname,@desc=tclassdesc from inserted print @id print @name print @desc end www.gimoo.net ========================================= 删除时触发器 create trigger tri_TblClass_delete_after on TblClass instead of delete as begin insert into TblClassBak select * from deleted end ======================================== 作者 xhccom

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