SQL server generates auto increment sequence number

Docking with other systems SQL Server Data sheet of , Some tables have no primary key , Then you need to generate a self incrementing sequence number . Then use the following method

select ROW_NUMBER() OVER(ORDER BY GETDATE()) as xh  from  test

ROW_NUMBER() OVER(ORDER BY GETDATE()) Time can be grouped and sorted , The result set will be generated after execution ,select These result sets will be numbered ( Every result set starts from 1 Numbered starting ).