Web Reference: Jun 23, 2025 · Subqueries in the FROM clause enables us to define temporary result sets that may be utilized by outer queries. They make complex SQL operations easier, enhance query readability, and provide flexibility in data filtering and aggregation. For people able to upgrade to the most recent version, as of PostgreSQL 16 providing an alias for subqueries is optional. Here's the patch where this was introduced. And a blog post that goes into more detail on the change. Nov 18, 2025 · A subquery introduced with an unmodified comparison operator (a comparison operator not followed by ANY or ALL) must return a single value rather than a list of values, like subqueries introduced with IN.
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