SQL random sample with groups

Question

I have a university graduate database and would like to extract a random sample of data of around 1000 records.

I want to ensure the sample is representative of the pop

Answer 1

I've done similar queries (but not on MS SQL) using a ROW_NUMBER approach:

select ...
from 
 ( select ...
     ,row_number() over (partition by coursecode order by newid()) as rn
   from degree
 ) as d 
join sample size as s
on d.coursecode = s.coursecode
and d.rn <= s.samplesize