自由的企鹅

摘要： create table #Left(EmpNo char(6),[hours] float) --if exists(select * from tempdb..sysobjects where id=object_id('tempdb..#Left')and type='U') if object_id('tempdb..#Left') is not null PRINT '存在' ELSE PRINT'不存在'drop table #Left 阅读全文