postgresql/no-leading-wildcard-like

Why this matters

A pattern like `'%foo'` or `'%foo%'` cannot use a plain B-tree index and forces PostgreSQL into a sequential scan. Use a `pg_trgm` GIN index or full-text search if substring matching is required.

Examples

SELECT id FROM users WHERE email LIKE '%@example.com';

SELECT id FROM users WHERE name ILIKE '%smith%';

SELECT id FROM users WHERE email LIKE 'admin@%';

SELECT id FROM users WHERE email = 'admin@example.com';

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-leading-wildcard-like": "warn",
    },
  },
];

Options

This rule has no options.