Difference between inner join, left join, and right join.
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🔹 INNER JOIN
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Returns only the rows where there is a match in both tables.
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Rows with no matching values are excluded.
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Example use case: Show customers who have placed orders.
Returns only the rows where there is a match in both tables.
Rows with no matching values are excluded.
Example use case: Show customers who have placed orders.
🔹 LEFT JOIN (LEFT OUTER JOIN)
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Returns all rows from the left table, plus matching rows from the right table.
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If no match exists, values from the right table are filled with NULL.
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Example use case: Show all customers, even if some haven’t placed any orders.
Returns all rows from the left table, plus matching rows from the right table.
If no match exists, values from the right table are filled with NULL.
Example use case: Show all customers, even if some haven’t placed any orders.
🔹 RIGHT JOIN (RIGHT OUTER JOIN)
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Returns all rows from the right table, plus matching rows from the left table.
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If no match exists, values from the left table are filled with NULL.
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Example use case: Show all orders, even if some aren’t linked to a customer yet.
Returns all rows from the right table, plus matching rows from the left table.
If no match exists, values from the left table are filled with NULL.
Example use case: Show all orders, even if some aren’t linked to a customer yet.
✅ Quick Comparison Table
Feature INNER JOIN LEFT JOIN RIGHT JOIN Matches Only rows with matches in both tables All rows from left + matches from right All rows from right + matches from left Unmatched Rows Excluded Included from left (NULL for right) Included from right (NULL for left) Result Size Smallest (only matches) At least as many rows as left table At least as many rows as right table
| Feature | INNER JOIN | LEFT JOIN | RIGHT JOIN |
|---|---|---|---|
| Matches | Only rows with matches in both tables | All rows from left + matches from right | All rows from right + matches from left |
| Unmatched Rows | Excluded | Included from left (NULL for right) | Included from right (NULL for left) |
| Result Size | Smallest (only matches) | At least as many rows as left table | At least as many rows as right table |
👉 In short:
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INNER JOIN → only common records.
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LEFT JOIN → all from left, matching from right.
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RIGHT JOIN → all from right, matching from left.
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