SQL
SELECT・INSERT・UPDATE など、データベースでよく書く SQL です。
ホームポジション（F と J）に指を置いて、スペース を押すとスタートします
SELECT * FROM users; SELECT id, name FROM users WHERE age >= 20; SELECT COUNT(*) FROM orders; SELECT * FROM items ORDER BY price DESC LIMIT 10; INSERT INTO users (name, age) VALUES ('Ken', 30); UPDATE users SET age = 31 WHERE id = 7; DELETE FROM sessions WHERE expires_at < now(); SELECT u.name, o.total FROM users u JOIN orders o ON o.user_id = u.id; SELECT city, AVG(age) FROM users GROUP BY city;