Is it possible to auto increment a column in SQL Server WITHOUT it being a primary key?
If yes how can this be done.
Thanks
Yes. There is no requirement that IDENTITY
columns be made a primary key.
CREATE TABLE T
(
X INT PRIMARY KEY,
Y INT IDENTITY(1,1)
)
Though I'm not sure when this would be useful. If you have a natural key that you want to use as the PK then you would probably want to put a unique constraint on the surrogate alternate key anyway.
For purposes of setting up FK relationships SQL Server doesn't care if the column(s) is the PK or not it just requires a unique index on it/them.
用IDENTITY关键字声明该列,并且仅不要在其上创建PRIMARY KEY约束。
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