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Code Inspection: 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.

Suppress an inspection in the editor

  1. Place the caret at the highlighted line and press Alt+Enter or click the Intention action icon.

  2. Click the arrow next to the inspection you want to suppress and select the necessary suppress action.

Last modified: 11 February 2024