[英]SQL Update Parent ID from Same table
Is it possible to update self referencing parent id with Update From query. 是否可以使用Update From查询更新自引用父ID。
Tables I have 我有桌子
Acc 加速器
AccID Name ParentAccID AccNumber
01 A Null A001
02 B Null A002
03 C Null A003
04 D Null A004
05 E Null A005
AccRef AccRef
AccNumber MasterAcc Name
A001 A001 A
A002 B
A003 A002 C
A004 A005 D
A005 A009 E
the way it should be joined is with AccNumber and then need to updat AccID in ParentAccID based on MasterAcc of that Acc. 它的加入方式是使用AccNumber,然后需要根据该Acc的MasterAcc在ParentAccID中更新AccID。 Only for existing AccNumber and if AccNumber and MasterAcc is not same (sorry if its big confusing)
仅适用于现有的AccNumber,并且AccNumber和MasterAcc不相同(对不起,如果混淆不清)
Result table should look like 结果表应如下所示
Acc 加速器
AccID Name ParentAccID AccNumber
01 A Null A001
02 B Null A002
03 C 02 A003
04 D 05 A004
05 E Null A005
Thanks 谢谢
Try this, 尝试这个,
DECLARE @Acc Table (AccID varchar(10),Name varchar(200),ParentAccID varchar(200), AccNumber varchar(200))
Insert into @Acc Values
('01','A',Null,'A001'),
('02','B',Null,'A002'),
('03','C',Null,'A003'),
('04','D',Null,'A004'),
('05','E',Null,'A005')
DECLARE @AccRef Table (AccNumber varchar(10),MasterAcc varchar(200),Name varchar(200))
Insert into @AccRef Values
('A001','A001','A'),
('A002',Null,'B'),
('A003','A002','C'),
('A004','A005','D'),
('A005','A009','E')
Update A set ParentAccID = M.AccID From @Acc A
Inner Join @AccRef R on R.AccNumber = A.AccNumber and R.AccNumber <> R.MasterAcc
Inner Join @Acc M on M.AccNumber = R.MasterAcc
Hope this is what you are looking for. 希望这是您想要的。
Finally, 最后,
Select * from @Acc
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