Question

I have a query of this form:

SELECT e.date, SUM(e.size) as bytes
FROM entries AS e
GROUP BY e.date
ORDER BY bytes DESC

and I have a column named client, which is composed of static values (0,1,2,3), so I want to get this:

SELECT e.date, SUM(e.size) as bytes
FROM entries AS e
WHERE e.client = 0
GROUP BY e.date
ORDER BY bytes DESC

repeated for every client type but in a single query to get a result of a summarized size for every client type:

   DATE    | CLI0-SIZE | CLI1-SIZE | CLI2-SIZE | CLI3-SIZE
2010-11-11      113         344         435         155

Answer 1

You can try this

SELECT e.date,
    SUM(CASE WHEN e.client = 0 THEN e.size ELSE 0 END) as CLI0-SIZE,
    SUM(CASE WHEN e.client = 1 THEN e.size ELSE 0 END) as CLI1-SIZE,
    SUM(CASE WHEN e.client = 2 THEN e.size ELSE 0 END) as CLI2-SIZE,
    SUM(CASE WHEN e.client = 3 THEN e.size ELSE 0 END) as CLI3-SIZE
FROM entries AS e
GROUP BY e.date