Code Inspection: Null comparison

Reports comparisons with NULL that can be replaced with IS NULL or IS NOT NULL operators.

Example (Microsoft SQL Server):

CREATE TABLE foo ( id int );

SELECT * FROM foo WHERE NULL = NULL;
SELECT * FROM foo WHERE NULL != NULL;

The NULL = NULL can be replaced with IS NULL, the NULL != NULL comparison with IS NOT NULL. To do this replacement, you can use Use IS NULL operator or Use IS NOT NULL operator quick-fixes.

SELECT * FROM foo WHERE NULL IS NULL;
SELECT * FROM foo WHERE NULL IS NOT NULL;

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Last modified: 11 February 2022