Converting MySQL select to PostgreSQL

Question

I have this query which works correctly in MySQL. More background on it here.

SELECT c.*, SUM(ABS(v.vote)) AS score
FROM categories c,items i, votes v
    W         


        

Answer 1

You have to list column names in SELECT which you are grouping in:

SELECT c.id, c.name, SUM(ABS(v.vote)) AS score
FROM categories c,items i, votes v
  WHERE c.id = i.category_id
  AND i.id = v.voteable_id
  AND v.created_at > '#{1.week.ago}'
GROUP BY c.id, c.name
ORDER BY score DESC LIMIT 8;

"It is not permissible to include column names in a SELECT clause that are not referenced in the GROUP BY clause."