SQL Server re-recovers AutoNumber column ordinal

1. TRUNCATE TABLE TableName
2. The DBCC checkident (tablename,reseed,1) Truncate command not only clears all data, but also restores the value of the identity's seed to its original value.

DBCC CHECKIDENT is more convenient, and you can specify the value of seed without deleting the data. DBCC checkident Just moves the index number of the auto-orchestration to the location you specified, but the actual number does not change, but a new record is automatically numbered when it is inserted, starting with the established record number, and skipping the number if it encounters an accumulated record number already there.

SQL Server re-recovers AutoNumber column ordinal