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Asked: 2026-05-11T07:07:42+00:00

I need to query this DB to get each row, but also the SUM

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I need to query this DB to get each row, but also the SUM of one of the column values of the results. I could use php to get the total value, but then I’d need to run two loops, one to get the total (which goes at the top above the results). So I’d prefer the query to catch it and just make a ‘total’ row, but the only way I’ve gotten it to work is with a subquery that is essentially a repeat of the original query. Is there a better way?

SELECT  CONCAT(u.firstname, ' ', u.lastname ) name, u.id, s.description, s.shiftstart, s.shiftend,      (SELECT      SUM( TIME_TO_SEC( TIMEDIFF( shiftend, shiftstart ) ) ) /3600     FROM shifts     WHERE id =  '$user'     AND DATE( shiftstart )     BETWEEN '$start'     AND '$end') total FROM shifts s INNER JOIN users u ON ( s.id = u.id ) WHERE s.id = '$user' AND DATE( shiftstart ) BETWEEN '$start' AND '$end' ORDER BY shiftstart

The above works and outputs:

name        id     description  shiftstart             shiftend               total Joe User    joeuser    Stuff    2009-01-05 07:45:00    2009-01-05 12:15:00    39.5000 Joe User    joeuser    Stuff    2009-01-05 13:00:00    2009-01-05 17:00:00    39.5000 Joe User    joeuser    Stuff    2009-01-06 07:45:00    2009-01-06 10:45:00    39.5000 Joe User    joeuser    Stuff    2009-01-06 10:45:00    2009-01-06 12:45:00    39.5000 Joe User    joeuser    Stuff    2009-01-06 13:30:00    2009-01-06 14:30:00    39.5000 Joe User    joeuser    Stuff    2009-01-06 14:30:00    2009-01-06 17:00:00    39.5000 Joe User    joeuser    Stuff    2009-01-07 09:45:00    2009-01-07 14:00:00    39.5000 Joe User    joeuser    Stuff    2009-01-07 15:00:00    2009-01-07 17:00:00    39.5000 Joe User    joeuser    Stuff    2009-01-08 08:00:00    2009-01-08 12:15:00    39.5000 Joe User    joeuser    Stuff    2009-01-08 13:15:00    2009-01-08 17:00:00    39.5000 Joe User    joeuser    Stuff    2009-01-09 07:45:00    2009-01-09 10:45:00    39.5000 Joe User    joeuser    Stuff    2009-01-09 11:45:00    2009-01-09 15:15:00    39.5000 Joe User    joeuser    Stuff    2009-01-09 15:15:00    2009-01-09 17:00:00    39.5000

Which is what I need, but probably not the best way to get it.

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1 Answer

  1. MySQL supports a special group-by modifier called ROLLUP.

    SELECT CONCAT(u.firstname, ' ', u.lastname ) name, u.id,    s.description, s.shiftstart, s.shiftend,    SUM( TIME_TO_SEC( TIMEDIFF( shiftend, shiftstart ) ) ) /3600 total FROM shifts s INNER JOIN users u ON ( s.id = u.id ) WHERE s.id = ? AND DATE( shiftstart ) BETWEEN ? AND ? GROUP BY u.id, s.shiftstart WITH ROLLUP ORDER BY shiftstart;
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