How do I get the MIN() of two fields in Postgres?

How do I get the MIN() of two fields in Postgres?

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What's the best way to select the minimum value from several columns?

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SQL: Group by minimum value in one field while selecting distinct rows

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Sort by minimum value of two columns

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MySQL: Select N rows, but with only unique values in one column

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Select min(date), max(date) and group by day from one column - SQL

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