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Database Testing Sandbox

Practice SQL queries, test transactions, learn about security, and analyze performance. Uses in-browser SQLite for instant feedback.

20 challenges5 easy8 medium5 hard2 expert

💻SQL Playground

📝

SQL Fundamentals

Practice SELECT, WHERE, ORDER BY, JOINs, and aggregations with instant feedback.

15 challenges

🔒

Security Testing

Learn SQL injection prevention, data masking, and constraint validation.

3 challenges

⚡

Performance Analysis

Analyze query plans with EXPLAIN, understand indexing and optimization.

2 challenges

💻 Testing Code Examples

Python (pytest + sqlite3)

import sqlite3
import pytest

@pytest.fixture
def db():
    conn = sqlite3.connect(':memory:')
    cursor = conn.cursor()
    # Setup schema and data
    cursor.executescript(SCHEMA + DATA)
    yield conn
    conn.close()

def test_user_query(db):
    cursor = db.cursor()
    cursor.execute(
        "SELECT * FROM users WHERE role = ?",
        ('admin',)
    )
    users = cursor.fetchall()
    assert len(users) == 1
    assert users[0][1] == 'John Doe'

TypeScript (better-sqlite3)

import Database from 'better-sqlite3';

describe('Database Tests', () => {
  let db: Database.Database;

  beforeEach(() => {
    db = new Database(':memory:');
    db.run(SCHEMA);
    db.run(DATA);
  });

  it('should find admin users', () => {
    const users = db
      .prepare('SELECT * FROM users WHERE role = ?')
      .all('admin');

    expect(users).toHaveLength(1);
    expect(users[0].name).toBe('John Doe');
  });
});

🛠️ Technology

📦

SQL.js

SQLite in browser

✏️

Monaco Editor

SQL highlighting

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Results Table

Instant feedback

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Reset Button

Fresh start