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SQL JOIN

A JOIN clause is used to combine rows from two or more tables, based on
a related column between them.

Let’s look at a selection from the “Orders” table:

Then, look at a selection from the “Customers” table:

Notice that the “CustomerID” column in the “Orders” table refers to the
“CustomerID” in the “Customers” table. The relationship between the two tables above
is the “CustomerID” column.

Then, we can create the following SQL statement (that contains an
INNER JOIN),
that selects records that have matching values in both tables:

and it will produce something like this:

Different Types of SQL JOINs

Here are the different types of the JOINs in SQL:

• (INNER) JOIN: Returns records that have matching values in both tables
• LEFT (OUTER) JOIN: Returns all records from the left table, and the matched records from the right table
• RIGHT (OUTER) JOIN: Returns all records from the right table, and the matched
  records from the left table
• FULL (OUTER) JOIN: Returns all records when there is a match in either left
  or right table

SELECT *
FROM Orders
LEFT JOIN Customers
=
;