作用：
删除七天前数据库中间表的资料，并收缩数据库
delete-Ecustom-xml-midtable.sql
delete Mid_bom where datediff(day,dty,getdate())>=7
delete Mid_cus where datediff(day,dty,getdate())>=7
delete Mid_exp where datediff(day,dty,getdate())>=7
delete Mid_inv where datediff(day,dty,getdate())>=7
delete Mid_itm where datediff(day,dty,getdate())>=7
delete Mid_opi where datediff(day,dty,getdate())>=7
delete Mid_opo where datediff(day,dty,getdate())>=7
delete Mid_ord where datediff(day,dty,getdate())>=7
delete Mid_pur where datediff(day,dty,getdate())>=7
delete Mid_rec where datediff(day,dty,getdate())>=7
delete Mid_stk where datediff(day,dty,getdate())>=7
delete Mid_vdr where datediff(day,dty,getdate())>=7
delete Mid_vla where datediff(day,dty,getdate())>=7
delete Mid_wip where datediff(day,dty,getdate())>=7
GO
DBCC SHRINKDATABASE(ECustomXML)
GO