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All the wizards and graphical tools are more or less broken. What the query
designer can do properly can be done by SQL learners after the very first
lessons had been learned. Anything slightly advanced has to be done in plain

MySQL has a datediff function:

In Base syntax (parsed mode, should also work in graphical view):
SELECT "date" AS "Date","ip"||' - '||"serial" AS "Printer", SUM("counter")AS
FROM "modifiedprintusage"
GROUP BY "date","ip","serial"

In MySQL syntax (direct SQL mode)
In Base syntax:
SELECT `date` AS `Date`,`ip`||' - '||`serial` AS `Printer`, SUM(`counter`)AS
FROM `modifiedprintusage`
GROUP BY `date`,`ip`,`serial`

It is supposed to return this 3-column table:
Date  |  Printer  |  Sum
2012-01-02 | 192.168.023 - Epson Blurb  |  232
2012-01-02 | 192.168.024 - HP Spitfire  |  1023

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