Using CASE instead of COALESCE function and vice versa

Reports situations when CASE and COALESCE calls are interchangeable. This inspection has the following intention actions: Replace with 'COALESCE' call and the opposite one Replace with CASE expression.

Example (MySQL):

SELECT
  -- this CASE may be replaced by COALESCE
	CASE
		WHEN C1 IS NOT NULL THEN C1
		ELSE 0
		END
FROM dual;

In the example, the CASE statement can be replaced with SELECT COALESCE(C1, 0) that produces the same output.

If you prefer using CASE expressions, select the Prefer CASE expressions over COALESCE function option on the inspection page.

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

SqlCaseVsCoalesce

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | SQL

Inspection options

Here you can find the description of settings available for the Using CASE instead of COALESCE function and vice versa inspection, and the reference of their default values.

Prefer CASE expressions over COALESCE function: Not selected

Inspection Details
By default bundled with:	CLion 2024.3, DataGrip 2024.3, GoLand 2024.3, IntelliJ IDEA 2024.3, JetBrains Rider 2024.3, PhpStorm 2024.3, PyCharm 2024.3, Qodana for .NET 2024.3, Qodana for Go 2024.3, Qodana for JS 2024.3, Qodana for JVM 2024.3, Qodana for PHP 2024.3, Qodana for Ruby 2024.3, RubyMine 2024.3, WebStorm 2024.3
Can be installed with plugin:	Database Tools and SQL, 243.23140

Last modified: 03 December 2024