Question

I’ve been working on a project that includes lots of summary statistics. One thing that would be very helpful for me would be to have a variable set equal to the result of a query that appeared on every line. Something like

declare @totalpop int
set @totalpop = select count(*) as [population]
from myTable

select sex, count(sex), @totalpop
from myTable

ninja edit on the query i tried, but it failed. Error is incorrect syntax near the keyword select

Answer 1

Based on your last paragraph, this seems to be what you want:

SELECT tsum.*, sum(cnt) over (partition by NULL) as TotalPop
FROM (SELECT gender, count(*) as cnt
      FROM t
      GROUP BY gender
     ) tsum

The expression with the “over” clause is a window function that adds up all the windows.