高校餐饮一卡通系统源码ifexists(select*fromdbo.sysobjectswhereid=object_id(N'[dbo].[card]')andOBJECTPROPERTY(id,N'IsUserTable')=1)droptable[dbo].[card]GOifexists(select*fromdbo.sysobjectswhereid=object_id(N'[dbo].[card_use]')andOBJECTPROPERTY(id,N'IsUserTable')=1)drop