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PHP SQL Inner Join
Posted on: January 16, 2009 at 12:00 AM

JOIN is used to query data from two or more tables. The inner join is used in the case of need to return rows when there is at least one match in both tables.

PHP SQL Inner Join

This Example illustrates how to use the inner join clause in the sql query.

JOIN is used to query data from two or more tables. The inner join is used in the case of need to return rows when there is at least one match in both tables. This is the good example to understand inner join clause because in this example we use a join clause between only two table. We use "emp" table and "message" table and find the name from emp table and messages from the message table where emp_id in the emp table and emp_id in the message table are equal. The fetched result is displayed on the browser as below. The complete source code is available below for download or copy the code as per your need.

Table: emp

Table: message

Source Code of innerJoin.php


<?php

  $con = mysql_connect("localhost","root","root");

  if (!$con) {

  die('Could not connect: ' . mysql_error());

  }



  mysql_select_db("test", $con);

  $result = mysql_query("SELECT emp.name, message.messages 

   FROM emp INNER JOIN message ON emp.emp_id = message.emp_id");

  echo "<table border='1'>

  <tr>

  <th>Name</th>

  <th>Message</th>

  </tr>";

  while ($row = mysql_fetch_array($result)) {

  echo "<tr>";

  echo "<td>" . $row['name'] . "</td>";

  echo "<td>" . $row['messages'] . "</td>";

  echo "</tr>";

  }

  echo "</table>";

  

  mysql_close($con);

?>

Output:

Download Source Code

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