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  • Users: Willi
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  1. Willi

    SQL multiple group by

    how can a multiple group by query be efficiently arranged? the query select A1,Z,count(*) from D group by A1,Z union select A2,Z,count(*) from D group by A2,Z union ... select An,Z,count(*) from D group by An,Z; at least in Oracle is not optimized. One pass over D should be sufficient to...

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