Create efficient JOIN operations for data combination.

```sql

-- Inner join

SELECT * FROM orders o

JOIN customers c ON o.customer_id = c.id;

-- Multiple joins

SELECT o.id, c.name, p.name as product

FROM orders o

JOIN customers c ON o.customer_id = c.id

JOIN products p ON o.product_id = p.id;

```

Join Types

- INNER JOIN

- LEFT JOIN

- RIGHT JOIN

- FULL JOIN

Best Practices

- Choose correct join type

- Optimize join conditions

- Use proper indexes

- Consider table order

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Generate JOIN Query

- Smart join detection

- Performance optimization

- Index recommendations