cheatsheets/sql-join.md at 25eaa9a78c68754311acf20099a7b51c5d51398e

mirror of https://github.com/onkelbeh/cheatsheets.git synced 2026-01-13 06:22:05 +01:00

- Update some sheets which have very long sections
- Remove `layout: 2017/sheet` (everything has the same layout now)
- Remove outdated sheets

2024-04-03 18:30:24 +11:00

title, category, updated, weight

title	category	updated	weight
SQL joins	Databases	2018-12-06	-1

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.

SELECT * FROM `A` INNER JOIN `B`

{: .-setup}

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

{: .-box-chars.-setup}