INNER JOIN returns only common records from both tables (left table and right table) if the records do not match then will not show. INNER JOIN is used between two tables.
For SELECT Statement
Syntax:-
SELECT table_name1.column_name(s), table_name2.column_name(s) FROM table_name1 INNER JOIN table_name2 ON table_name1.column_name=table2.column_name
Example:- Suppose we have two table employees and emp_salary.
employees Table:- this table has the employee’s details.
+----+------------+-----------+----------------+-----------+ | id | first_name | last_name | email | country | +----+------------+-----------+----------------+-----------+ | 1 | John | Tailor | john@abc.com | USA | | 2 | Rom | Tailor | rom@abc.com | USA | | 3 | Andrew | Symonds | andrew@abc.com | Australia | | 4 | Miacle | Tailor | miacle@abc.com | Australia | | 5 | Sachin | Tendulkar | sachin@abc.com | India | | 6 | Virat | Kohli | virat@abc.com | India | | 7 | rohit | NULL | rohit@abc.com | India |
emp_salary table:- this table employee’s salary details.
| id | emp_id | salary | +----+--------+--------+ | 1 | 5 | 200000 | | 2 | 6 | 180000 | | 3 | 8 | 300000 | | 4 | 9 | 400000 | +----+--------+--------+
Find the employees who have salary.
Query:-
SELECT employees.id,employees.first_name,employees.last_name, employees.email,employees.country,emp_salary.salary FROM employees INNER JOIN emp_salary On employees.id=emp_salary.emp_id
Output:-
+----+------------+-----------+----------------+---------+--------+ | id | first_name | last_name | email | country | salary | +----+------------+-----------+----------------+---------+--------+ | 5 | Sachin | Tendulkar | sachin@abc.com | India | 200000 | | 6 | Virat | Kohli | virat@abc.com | India | 180000 | +----+------------+-----------+----------------+---------+--------+