Question

I want to get the first row for every GV(TeacherID)

GV |   Class|  SUM 
GV1|   L001 |  5000 
GV1|   L002 |  5000 
GV1|   L003 |  5000 
GV2|   L002 |  7000 
GV2|   L003 |  7000 
GV2|   L001 |  7000 
GV3|   L001 |  8000 
GV3|   L002 |  8000 
GV3|   L003 |  8000 

Help me.

Answer 1

Edit: ok, now you’ve edited the question such that this answer looks completely irrelevant…sigh…I’ll leave it in case it helps you get started. Cheers.

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The simplest solution given your specs:

  select teacherid 
    from mytable 
group by teacherid;

If you need other information in addition to the teacherid:

  select teacherid, ...other cols...
    from (select teacherid, ...other cols...
                 row_number() over (
                     partition by teacherid
                     order by classid /* or class as per edit */) as row_num
            from mytable) my_derived_table
   where my_derived_table.row_num = 1;

Caveat emptor: I don’t have an installation of SQL-Server handy to test on, so syntax may not be exactly correct; but it’s close.