Select and Group by together

Question

I have my query like this:

Select 
  a.abc,
  a.cde,
  a.efg,
  a.agh,
  c.dummy
  p.test
  max(b.this)
  sum(b.sugar)
  sum(b.bucket)
  sum(b.something)
         


        

Answer 1

SQL will insist that any column in the SELECT section is either included in the GROUP BY section or has an aggregate function applied to it in the SELECT section.

This article gives a nice explanation of why this is the case. The article is sql server specific but the principle should be roughly similar for all RDBMS