How do I (or can I) SELECT DISTINCT on multiple columns?

How do I (or can I) SELECT DISTINCT on multiple columns?

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postgresql COUNT(DISTINCT ...) very slow

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Postgres: Distinct but only for one column

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PG::Error: SELECT DISTINCT, ORDER BY expressions must appear in select list

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Efficient latest record query with Postgresql

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GROUP BY and COUNT in PostgreSQL

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DISTINCT ON in an aggregate function in postgres

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Converting SELECT DISTINCT ON queries from Postgresql to MySQL

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Is there a way to ensure WHERE clause happens after DISTINCT?

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SqlAlchemy: count of distinct over multiple columns

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PostgreSQL: Select only the first record per id based on sort order

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Using a DISTINCT clause to filter data but still pull other fields that are not DISTINCT

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Ordering distinct column values by (first value of) other column in aggregate function

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distinct() function (not select qualifier) in postgres

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How to eliminate duplicates from select query?

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