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Unused subquery item

Reports columns, aliases, and other subquery items that are not referenced in the outer query expression.

Example (PostgreSQL):

CREATE TABLE for_subquery(id INT); SELECT a, q FROM (SELECT 1 AS a, 10 AS b, 2 + 3 AS q, id FROM for_subquery) x;

We reference a and q aliases from a subquery. But the b alias and the id column are not referenced in the outer SELECT statement. Therefore, b and id are grayed out.

Inspection Details

Available in:

AppCode 2023.3, CLion 2023.3, DataGrip 2023.3, DataSpell 2023.3, GoLand 2023.3, IntelliJ IDEA 2023.3, JetBrains Rider 2023.1, PhpStorm 2023.3, PyCharm 2023.3, Qodana for .NET 2023.1, Qodana for JVM 2023.3, Qodana for PHP 2023.3, Qodana for Ruby 2023.3, RubyMine 2023.3


Database Tools and SQL, 233.SNAPSHOT

Last modified: 13 July 2023