postgresql/no-cross-join

Why this matters

If the intent really is a cartesian product, write `JOIN ... ON true` so the intent reads back. PostgreSQL rejects `INNER JOIN b` without `ON`/`USING`, so the explicit `CROSS JOIN` is the only form this rule sees in practice.

Examples

SELECT * FROM a CROSS JOIN b;

SELECT * FROM a JOIN b ON a.id = b.id;

SELECT * FROM a JOIN b ON true; -- intentional cartesian

Configure it

// eslint.config.js
import postgresql from "eslint-plugin-postgresql";

export default [
  {
    files: ["**/*.sql"],
    languageOptions: {
      parser: postgresql.configs.recommended.languageOptions.parser,
    },
    plugins: { postgresql },
    rules: {
      "postgresql/no-cross-join": "warn",
    },
  },
];

Options

This rule has no options.