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  • How to use join query in PHP with example
  • Learn MySql

How to use join query in PHP with example

Spoke Right January 3, 2023 1 min read

Using JOin Example

PHP uses mysqli query() or mysql_query() function to get records from a MySQL tables using Joins. This function takes two parameters and returns TRUE on success or FALSE on failure.

Syntax

$mysqli->query($sql,$resultmode)
Sr.No.Parameter & Description
1

$sql

Required – SQL query to get records from multiple tables using Join.

2

$resultmode

Optional – Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used.

First create a table in MySQL using following script and insert two records.

create table tcount_tbl(
   tutorial_author VARCHAR(40) NOT NULL,
   tutorial_count int
);

insert into tcount_tbl values('Mahesh', 3);
insert into tcount_tbl values('Suresh', 1);

Example

Try the following example to get records from a two tables using Join. −

Copy and paste the following example as mysql_example.php −

<html>
   <head>
      <title>Using joins on MySQL Tables</title>
   </head>
   <body>
      <?php
         $dbhost = 'localhost';
         $dbuser = 'root';
         $dbpass = '[email protected]';
         $dbname = 'TUTORIALS';
         $mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
         
         if($mysqli->connect_errno ) {
            printf("Connect failed: %s<br />", $mysqli->connect_error);
            exit();
         }
         printf('Connected successfully.<br />');
         
         $sql = 'SELECT a.tutorial_id, a.tutorial_author, b.tutorial_count
				FROM tutorials_tbl a, tcount_tbl b
				WHERE a.tutorial_author = b.tutorial_author';
         $result = $mysqli->query($sql);
           
         if ($result->num_rows > 0) {
            while($row = $result->fetch_assoc()) {
               printf("Id: %s, Author: %s, Count: %d <br />", 
                  $row["tutorial_id"], 
                  $row["tutorial_author"], 
                  $row["tutorial_count"]);               
            }
         } else {
            printf('No record found.<br />');
         }
         mysqli_free_result($result);
         $mysqli->close();
      ?>
   </body>
</html>

Output

Access the mysql_example.php deployed on apache web server and verify the output.

Connected successfully.
Id: 1, Author: Mahesh, Count: 3
Id: 2, Author: Mahesh, Count: 3
Id: 3, Author: Mahesh, Count: 3
Id: 5, Author: Suresh, Count: 1

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Next: How is NULL value handled in MySQL give example

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