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Mysql Join Query
Posted on: January 16, 2009 at 12:00 AM

Mysql Join Query is used to return the matchable records from both table on the basis of common column.

Mysql Join Query

Mysql Join Query is used to return the matchable records from both table on the basis of common column.

Understand with Example

The Tutorial illustrate an example from Mysql Join Query. To grasp this we create a table roseindia with fieldname and data type.

Query to Create Table named roseindia:-

mysql> CREATE TABLE roseindia (     
            -> Empid int(11),          
             ->firstname varchar(30),  
            -> city varchar(30)        
          -> );
Query OK, 0 rows affected (0.05 sec)

Query to insert data into Table named roseindia:-

The insert into statement add the records or rows into table 'roseindia'.

mysql>  insert into roseindia values(01,'Girish','Nainital');
Query OK, 1 row affected (0.02 sec)

mysql>  insert into roseindia values(02,'Komal','Merrut');
Query OK, 1 row affected (0.00 sec)

mysql>  insert into roseindia values(03,'Amit','Lucknow');
Query OK, 1 row affected (0.02 sec)

mysql>  insert into roseindia values(04,'Sandeep','Lucknow');
Query OK, 1 row affected (0.03 sec)

Query to view data of Table named roseindia:-

mysql> select * from roseindia;

Output:-

+-------+-----------+----------+
| Empid | firstname | city     |
+-------+-----------+----------+
|     1 | Girish    | Nainital |
|     2 | Komal     | Merrut   |
|     3 | Amit      | Lucknow  |
|     4 | Sandeep   | Lucknow  |
+-------+-----------+----------+
4 rows in set (0.00 sec)

Query to Create Table newstrack:-

Now we create another table 'newstrack'. The create table is used to create table 'newstrack'.

mysql> CREATE TABLE newstrack (   
        ->     Empid int(11),          
         ->    firstname varchar(10),  
         ->    email varchar(30) 
          -> );
Query OK, 0 rows affected (0.03 sec)

Query to insert data into Table named newstrack:-

mysql>  insert into newstrack values(01,'Suman','girish@gmail.com');
Query OK, 1 row affected (0.02 sec)

mysql>  insert into newstrack values(02,'Ravi','komal@gmail.com');
Query OK, 1 row affected (0.01 sec)

mysql>  insert into newstrack values(03,'Santosh','Amit@gmail.com');
Query OK, 1 row affected (0.01 sec)

Query to view data of Table named newstrack:-

mysql> select * from newstrack;

Output:-

+-------+-----------+------------------+
| Empid | firstname | email            |
+-------+-----------+------------------+
|     1 | Suman     | girish.gmail.com |
|     2 | Ravi      | komal.gmail.com  |
|     3 | Santosh   | Amit.gmail.com   |
+-------+-----------+------------------+
3 rows in set (0.00 sec)

Query to join data of Table's created above:-

The given below code uses join query that return you the matches records from table 'roseindia' and 'newstrack' on the basis of common column Empid on respective tables.

mysql> select * from roseindia as R
    -> Right Join newstrack as N
    -> on R.empid=N.empid;

Output:-

+-------+-----------+----------+-------+-----------+------------------+
| Empid | firstname | city     | Empid | firstname | email            |
+-------+-----------+----------+-------+-----------+------------------+
|     1 | Girish    | Nainital |     1 | Suman     | girish.gmail.com |
|     2 | Komal     | Merrut   |     2 | Ravi      | komal.gmail.com  |
|     3 | Amit      | Lucknow  |     3 | Santosh   | Amit.gmail.com   |
+-------+-----------+----------+-------+-----------+------------------+
3 rows in set (0.00 sec)

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