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SQL joins Cheat Sheet in May 2024

Last Updated: 13 May 2024

README.md

Example

SELECT * FROM order_items \
  LEFT OUTER JOIN orders \
  ON order_items.order_id = orders.id

{: .-wrap}

Joins are typically added to SELECT statements to add more columns and records.

Diagram

SELECT * FROM `A` INNER JOIN `B`

{: .-setup}

┌────────┐
│ A  ┌───┼────┐
│    │ ∩ │    │
└────┼───┘  B │
     └────────┘

{: .-box-chars.-setup}

Join What
Inner join
Left outer join A +
Right outer join + B
Full outer join A + + B

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