SQL : PostgreSQL: Why can't subqueries as expressions return more than one row, but functions can?

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SQL : PostgreSQL: Why can't subqueries as expressions return more than one row, but functions can?
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SQL : PostgreSQL: Why can't subqueries as expressions return more than one row, but functions can?
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Why return : subqueries can? expressions one PostgreSQL: than as can't more row, functions but SQL



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