问题
I created a primary key to be autoincrement.
- I added two rows:
ID=1, ID=2 - I deleted these two rows.
- I added a new row, but the new row's ID was:
ID=3
How can I reset or restart the autoincrement to 1?
回答1:
If you use the DBCC CHECKIDENT command:
DBCC CHECKIDENT ("YourTableNameHere", RESEED, 1);
But use with CAUTION! - this will just reset the IDENTITY to 1 - so your next inserts will get values 1, then 2, and then 3 --> and you'll have a clash with your pre-existing value of 3 here!
IDENTITY just dishes out numbers in consecutive order - it does NOT in any way make sure there are no conflicts! If you already have values - do not reseed back to a lower value!
回答2:
I'm using SQL Server 2012 and the DBCC CHECKIDENT ("YourTableNameHere", RESEED, 1) causes a value of 2 on the very next insert.
So for SQL Server 2012, change the 1 to 0 to get a value of 1 for your next record insert:
DBCC CHECKIDENT ("YourTableNameHere", RESEED, 0); -- value will be 1 for the next record insert
来源：https://stackoverflow.com/questions/13858062/reset-autoincrement-in-microsoft-sql-server-2008-r2