SQL INNER JOIN

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 |
+----+------------+-----------+----------------+---------+--------+