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  1. Aug 2024
  2. stackoverflow.com stackoverflow.com
    Select first row in each GROUP BY group?
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    1. TylerRick 14 Aug 2024
      The perfect index for the above query would be a multi-column index spanning all three columns in matching sequence and with matching sort order:
      database: performance SQL: indexes
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    stackoverflow.com/questions/3800551/select-first-row-in-each-group-by-group