Each derived table should have alias

Reports derived tables without aliases.

Example (MySQL):

CREATE TABLE table1 (id INT, name VARCHAR(20), cats FLOAT);
CREATE TABLE table2 (id INT, age INTEGER);

SELECT id AS ID, name, cats, age
FROM (SELECT table1.id, name, cats, age
FROM table1
JOIN table2 ON table1.id = table2.id);

According to Derived Tables at dev.mysql.com, an alias is mandatory. You can add the alias by using the Introduce alias quick-fix.

After the quick-fix is applied:

SELECT id AS ID, name, cats, age
FROM (SELECT table1.id, name, cats, age
FROM table1
JOIN table2 ON table1.id = table2.id);

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.

SqlDerivedTableAlias

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 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