The while method of mssql loop record

1. Define variables

Declare @i Int

 

2. Get a single record

Select @i= Min ([id]) From [database name] Where <search condition>

 

3. While loop

While @i Is Not Null

　　Begin

　　<executive part>

　　/* Refetch i until there are no records */

　　Select @i=Min([id]) From [database name] Where <!Search conditions> And  [id]>@i

End