Dba: WHERE A=x DISTINCT ON (B), with a composite index on (A, B, C)

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WHERE A=x DISTINCT ON (B), with a composite index on (A, B, C)
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(dba.stackexchange.com/users/3684/erwin-brandstetter)Erwin Brandstetter
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postgresql postgresql-performance greatest-n-per-group index query-performance



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