Update for 03-03-22 22:00

This commit is contained in:
Tyler Perkins 2022-03-03 22:00:01 -05:00
parent 6d12e3e5c1
commit c3407617c5

View File

@ -109,6 +109,26 @@ grouping totals based upon some other row.
`SELECT Team, COUNT(*) FROM Players GROUP BY Team`
=== JOIN ===
`JOIN` allows two tables to be returned together, where they are 'joined' upon
a shared field.
{{{
SELECT Orders.ID, Customers.Name, Orders.Name
FROM Orders
INNER JOIN Customers ON Orders.CustomerId=Customers.Id
}}}
There are four types of joins
* `INNER JOIN` returns all records that having matching records in both tables
* `LEFT OUTER JOIN` returns all records from the left (Orders in above example)
table, and the matched records from the right table
* `RIGHT OUTER JOIN` returns all records from the right (Customers in above
example) table, and the matched records from the left table
* `FULL OUTER JOIN` returns all records when there is a match in either the
left or right table
== Views ==
A view can be created with the following command