MYSQL with SUM results and GROUP BY - mysql

Question

I've got this query and I want to SUM all the results of the query grouped by the column omschrijving.
The query
SELECT b.BoekRegelBedrag as total, c.omschrijving, ctl.vd1, b.BoekRegelId
FROM condensations as c
LEFT JOIN condensations_to_ledgers as ctl
ON ctl.vd1 = c.code
LEFT JOIN BoekstukRegels as b
ON b.BoekRegelGrootboekNr = ctl.GrootboekNummer
LEFT JOIN GrootboekRekeningen as g
ON g.GrootboekNummer = ctl.GrootboekNummer
WHERE c.bedrijf_id = 118
AND b.BoekregelUserId = 118
AND ctl.bedrijf_id = 118
AND g.GrootboekUserId = 118
AND c.code < 10
AND g.BaSoort = 2
AND b.BoekRegelPeriode BETWEEN 201000 AND 201013
GROUP BY b.BoekRegelId
Is there a simple way to do this?
EDIT
I tried to SUM BoekRegelBedrag but then each record sums up a part in one way or the other and i got 4 results instead of one result with the total of the summed column

Answer 1

Since you've not clearly stipulated which column(s) should be summed, we have to guess. Assuming that the BoekRegelId column should not be summed (it seldom makes sense to do arithmetic on ID numbers) — and then not summing ctl.vd1 per comment — then:
SELECT omschrijving, SUM(total) AS sum_total
FROM (SELECT b.BoekRegelBedrag as total, c.omschrijving, ctl.vd1, b.BoekRegelId
FROM condensations AS c
LEFT JOIN condensations_to_ledgers AS ctl
ON ctl.vd1 = c.code
LEFT JOIN BoekstukRegels AS b
ON b.BoekRegelGrootboekNr = ctl.GrootboekNummer
LEFT JOIN GrootboekRekeningen AS g
ON g.GrootboekNummer = ctl.GrootboekNummer
WHERE c.bedrijf_id = 118
AND b.BoekregelUserId = 118
AND ctl.bedrijf_id = 118
AND g.GrootboekUserId = 118
AND c.code < 10
AND g.BaSoort = 2
AND b.BoekRegelPeriode BETWEEN 201000 AND 201013
GROUP BY b.BoekRegelId
) AS I
GROUP BY omschrijving;
Basically, I'm using your original query result as a 'table' in the FROM clause, and then aggregating on its columns in a way which might be what you're after.
An alternative, simpler approach may also be feasible if the core query is close to what you wanted:
SELECT c.omschrijving, SUM(b.BoekRegelBedrag) as total
FROM condensations AS c
LEFT JOIN condensations_to_ledgers AS ctl ON ctl.vd1 = c.code
LEFT JOIN BoekstukRegels AS b ON b.BoekRegelGrootboekNr = ctl.GrootboekNummer
LEFT JOIN GrootboekRekeningen AS g ON g.GrootboekNummer = ctl.GrootboekNummer
WHERE c.bedrijf_id = 118
AND b.BoekregelUserId = 118
AND ctl.bedrijf_id = 118
AND g.GrootboekUserId = 118
AND c.code < 10
AND g.BaSoort = 2
AND b.BoekRegelPeriode BETWEEN 201000 AND 201013
GROUP BY c.omschrijving;