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alter table dbo.C
add constraint FK_C_A_AID
foreign key(AID) references dbo.A(AID)
on delete cascade
on update casade
go
 
 
alter table dbo.C
add constraint FK_C_B_BID
foreign key(BID) references dbo.B(BID)
on delete cascade
on update casade
go
 
 
 
 
 
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Alter TABLE [dbo].[T_USERGROUP] ADD
        CONSTRAINT [FK_T_USERGROUP_T_ACCTTEMPLATE] FOREIGN KEY
        (
                [ATNAME]
        ) REFERENCES [dbo].[T_ACCTTEMPLATE] (
                [ATNAME]
        ) ON Update CASCADE ON Delete CASCADE
 
 
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     A:
 
     int id
     varchar(20) name
    
     C:
     int id
     int Cid
     varchar(100) info
 
     ¼ÙÉè±íA¡¢CµÄ×Ö¶ÎÈçÉÏ£º
 
     ÈçÒÔ¼¶ÁªÉ¾³ý±íA¡¢C¼Ç¼ΪÀý£¬ÊµÏÖÓï¾äÈçÏ£º
     (Èç¹ûɾ³ý±íAÖеļǼ£¬Ôò×Ô¶¯É¾³ý±íCÖÐÓë±íAÖÐidÏàͬµÄ¼Ç¼)
 
    CREATE   TRIGGER trg_a
ON A
FOR INSERT,UPDATE,DELETE
AS
BEGIN
              DECLARE @nInsRows   INT   --ÓÃÓÚ²åÈë¼Ç¼ÌõÊýͳ¼Æ
    &n


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