----删除关键字的同时也清理AP表中所有关联这个ID的数据
create trigger Trg_UpdateAppWordOnDelKeyWord
on [dbo].[tbl_KeyWord]
for delete
as
declare @work_id int
select @work_id = Word_Id from deleted
update [dbo].[tbl_APP] set APP_Word.modify('delete /id[.=sql:variable("@work_id")]') where APP_Word.exist('/id[.=sql:variable("@work_id")]') > 0
go

关键字是:sql:variable

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