MySQL JOIN

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JOIN means "to combine two or more tables".

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

We've a table named Students and Teachers in our database that contains the following records:

Table : Students

ROLL_NO	NAME	SUBJECT
1	Will	C++
2	SAM	Python
3	Rani	Node.js
4	Rim	Java
5	Micheal	JAVA
6	Lara	PHP

Table : Teachers

TECH_NO	NAME	SUBJECT	ROLL_NO
20	Kayla	PHP	6
21	Albert	Java	2
21	Albert	Java	5
22	Helen	Node.js	3
23	Anne	Python	2
24	Jaime	C++	1

Notice that the "ROLL_NO" column in the "Teachers" table refers to the "ROLL_NO" in the "Students" table. The relationship between the two tables above is the "ROLL_NO" column.

We can make different type of Join statement with this kind of relations in a table.

Types of MySQL JOINs

(INNER) JOIN : A join that returns only those rows that have a match in both joined 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

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MySQL - JOIN

Table : Students

Table : Teachers

Types of MySQL JOINs