学步园

• 当删除BG_Group表中的一条数据时，级联删除BG_Purview表中的若干条记录

  CREATE TRIGGER [dbo].[Del_Purview] ON [dbo].[BG_Group]     
  AFTER DELETE     
  AS   
      IF @@ROWCOUNT = 0
      RETURN
  
      DELETE FROM BG_Purview WHERE GroupID IN (SELECT GroupID FROM deleted)