Question

I have the following statement. The results come back but the records aren’t sorted. What am I doing wrong?

SELECT * 
FROM (
SELECT name, date, SUM(volume) AS sumVolume, SUM(value) AS sumValue
FROM table
WHERE id = 12
) AS TempTable
ORDER BY date DESC

Answer 1

This query won’t work as you intended. Using SUM (which is an AGGREGATE function) within your derived table is going to give you exactely ONE row back – unless you start to GROUP BY another column.

In your example, even if you’d group by id you’d still only get a single row, though (that’s because you’d group by a single id). Alter the WHERE statement to include more ids and group them within the derived table.

Also, take a look at the MySQL manual on the various aggregate functions to get a feeling of what they do.

Regards

EDIT
Since the OP’s requirements have somewhat become clear, I’ll try to help him with his query:

SELECT x.name, x.date, y.vol, y.val
  FROM table AS x,
      ( SELECT MAX(date) AS date, SUM(volume) AS vol, SUM(value) AS val
          FROM table
         WHERE id = 12 ) AS y
 WHERE x.id = 12,
   AND x.date = y.date