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MySQL JOINSMySQL JOINS 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:
MySQL Inner JOIN (Simple Join)The MySQL 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; Image representation: Let's take an example: Consider two tables "officers" and "students", having the following data. 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; Output: MySQL Left Outer JoinThe 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; Image representation: Let's take an example: Consider two tables "officers" and "students", having the following data. 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; Output: MySQL Right Outer JoinThe MySQL 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; Image representation: Let's take an example: Consider two tables "officers" and "students", having the following data. 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; Output:
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