SQLite Outer Join

In SQL standard, there are three types of outer joins:

Left outer join
Right outer join
Full outer join.

But, SQLite supports only Left Outer Join.

SQlite Left Outer Join

The SQLite left outer join is used to fetch all rows from the left hand table specified in the ON condition and only those rows from the right table where the join condition is satisfied.

Syntax:

snippet

SELECT ... FROM table1 LEFT OUTER JOIN table2 ON conditional_expression

snippet

SELECT ... FROM table1 LEFT OUTER JOIN table2 USING ( column1 ,......

Image representation:

We have two tables "STUDENT" and "DEPARTMENT".

The "STUDENT" table is having the following data:

The "DEPARTMENT" table is having the following data:

Let's take the above two tables "STUDENT" and "DEPARTMENT" and make an inner join according to the below conditions:

Example:

snippet

SELECT EMP_ID, NAME, DEPT FROM STUDENT LEFT OUTER JOIN DEPARTMENT
ON STUDENT.ID = DEPARTMENT.EMP_ID;