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Wat ook zal werken:

SELECT "Kostenplaats", SUM( "Bedrag" ), "Naam", "Boeking" 
GROUP BY "Kostenplaats", "Naam", "Boeking" 
ORDER BY "Kostenplaats" ASC, "Naam" ASC, "Boeking" ASC


Ik denk dat het probleem hier in zit:

When a |<group by clause>| is used, only the columns used in the |<group
by clause>| or expressions used there, can be used in the |<select
list>|, together with any |<aggregate function>| on other columns. In
other words, the column names or expressions listed in the GROUP BY cluase
dictate what can be used in the |<select list>|. After the rows of the
table formed by the |<from clause>| and the |<where clause>| are
finalised, the grouping operation groups together the rows that have the
same values in the columns of the |<group by clause>|. Then any
|<aggregate function>| in the |<select list>| is performed on each
group, and for each group, a row is formed that contains the values of the
columns of the |<group by clause>| and the values returned from each
|<aggregate function>|.

SELECT "Kostenplaats", "YYYY-MM-DD", SUM( "Bedrag" ), "Naam",
"Boeking" FROM "ASNDPK" GROUP BY "Kostenplaats" ORDER BY
"Kostenplaats" ASC, "YYYY-MM-DD" ASC

Hier heeft Base een probleem mee...

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