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2026-07-29 16:01
Database

Subquery in WHERE

QueryValidateMedium
Try Interactive Demo

Description

Find products that have never been ordered.

Test Scenario

-- Your query:
SELECT name FROM products
WHERE id NOT IN (SELECT DISTINCT product_id FROM order_items);

-- Expected: Products with no orders (Monitor Stand, Notebook Set)

Testing Tips

  • •Subquery returns a set of values
  • •NOT IN excludes matching values
  • •Subquery executes first
// Playwright API Testing - Database
import { test, expect } from '@playwright/test';


test('Database query via API', async ({ request }) => {
  const response = await request.post('/api/database/query', {
    data: {
      sql: 'SELECT * FROM users WHERE id = ?',
      params: [1]
    }
  });


  expect(response.ok()).toBeTruthy();
  const { rows } = await response.json();
  expect(rows.length).toBeGreaterThan(0);
});

Challenge ID: sql-subquery

2 frameworks available