尝试使用不同的语法

Have a try with a bit different syntax

DBCC CHECKIDENT ("product", RESEED, 999);
GO

还要确保您拥有足够的权限，即其中一项：

- sysadmin

- db_owner

- db_ddladmin

Also make sure that you have the sufficient privileges, namely one of these:
- sysadmin
- db_owner
- db_ddladmin