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MySQL Join are used with SELECT statement. It is used to retrieve data from multiple tables. It is performed whenever you need to fetch records from two or more tables.
There are three types of MySQL joins:
- My SQL INNER JOIN (or sometimes called simple join)
- My SQL LEFT OUTER JOIN (or sometimes called LEFT JOIN)
- My SQL RIGHT OUTER JOIN (or sometimes called RIGHT JOIN)
MySQL Inner JOIN (Simple Join)
The My SQL INNER JOIN is used to return all rows from multiple tables where the join condition is satisfied. It is the most common type of join.
Syntax:
SELECT columns
FROM table1
INNER JOIN table2
ON table1.column = table2.column;
Let’s take an example:
Consider two tables “officers” and “students”
Execute the following query:
SELECT officers.officer_name, officers.address, students.course_name
FROM officers
INNER JOIN students
ON officers.officer_id = students.student_id;
My SQL Left Outer Join
The LEFT OUTER JOIN returns all rows from the left hand table specified in the ON condition and only those rows from the other table where the join condition is fulfilled.
Syntax:
SELECT columns
FROM table1
LEFT [OUTER] JOIN table2
ON table1.column = table2.column;
Let’s take an example:
Consider two tables “officers” and “students”
Execute the following query:
SELECT officers.officer_name, officers.address, students.course_name
FROM officers
LEFT JOIN students
ON officers.officer_id = students.student_id;
MySQL Right Outer Join
The My SQL Right Outer Join returns all rows from the RIGHT-hand table specified in the ON condition and only those rows from the other table where he join condition is fulfilled.
Syntax:
SELECT columns
FROM table1
RIGHT [OUTER] JOIN table2
ON table1.column = table2.column;
Let’s take an example:
Consider two tables “officers” and “students”
Execute the following query:
SELECT officers.officer_name, officers.address, students.course_name, students.student_name
FROM officers
RIGHT JOIN students
ON officers.officer_id = students.student_id;