This content originally appeared on DEV Community and was authored by Lâm
Diagram
SELECT * FROM `A` INNER JOIN `B`
┌────────┐
│ A ┌───┼────┐
│ │ ∩ │ │
└────┼───┘ B │
└────────┘
| Join | What |
|---|---|
| Inner join | ∩ |
| Left outer join |
A + ∩
|
| Right outer join |
∩ + B
|
| Full outer join |
A + ∩ + B
|
Example
SELECT * FROM order_items \
LEFT OUTER JOIN orders \
ON order_items.order_id = orders.id
Joins are typically added to SELECT statements to add more columns and records.
Reference
This content originally appeared on DEV Community and was authored by Lâm
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Lâm | Sciencx (2021-05-13T10:34:12+00:00) Sql Joins Cheat Sheet. Retrieved from https://www.scien.cx/2021/05/13/sql-joins-cheat-sheet/
" » Sql Joins Cheat Sheet." Lâm | Sciencx - Thursday May 13, 2021, https://www.scien.cx/2021/05/13/sql-joins-cheat-sheet/
HARVARDLâm | Sciencx Thursday May 13, 2021 » Sql Joins Cheat Sheet., viewed ,<https://www.scien.cx/2021/05/13/sql-joins-cheat-sheet/>
VANCOUVERLâm | Sciencx - » Sql Joins Cheat Sheet. [Internet]. [Accessed ]. Available from: https://www.scien.cx/2021/05/13/sql-joins-cheat-sheet/
CHICAGO" » Sql Joins Cheat Sheet." Lâm | Sciencx - Accessed . https://www.scien.cx/2021/05/13/sql-joins-cheat-sheet/
IEEE" » Sql Joins Cheat Sheet." Lâm | Sciencx [Online]. Available: https://www.scien.cx/2021/05/13/sql-joins-cheat-sheet/. [Accessed: ]
rf:citation » Sql Joins Cheat Sheet | Lâm | Sciencx | https://www.scien.cx/2021/05/13/sql-joins-cheat-sheet/ |
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