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No really, you have to pick one

November 29, 2011 Onsi Fakhouri

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“Postgres SELECT * GROUP BY insists that all selected fields must either appear in the GROUP BY or be aggregated.”

Many agreed that this is, in fact, how a database should behave and that MySQL’s leniency on this matter is faulty. If you select a field that you don’t group by, you must tell Postgres how to combine the sub-set of values that fall in a given group into a single result (should it take the max? the min? the mean? the most purple?).

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No really, you have to pick one