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sqlbeginner

Join - Technique 19

Advanced join techniques

sql
SELECT o.id, c.name, p.title, oi.quantity
FROM orders o
JOIN customers c ON c.id = o.customer_id
JOIN order_items oi ON oi.order_id = o.id
JOIN products p ON p.id = oi.product_id
WHERE o.created_at >= current_date - interval '7 days';

Use Cases

  • database operations
  • data management

Tags

#sql#database#join

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Best for: Top-N per group queries efficiently

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LATERAL Join for Correlated Subqueries

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Best for: Top-N per group queries

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Best for: database operations

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