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Deleting Data from MySQL Database


Data can be deleted from MySQL tables by executing SQL DELETE statement through PHP function mysql_query.

Below is a simple example to delete records into employee table. To delete a record in any table it is required to locate that record by using a conditional clause. Below example uses primary key to match a record in employee table.


Try out following example to understand delete operation. You need to provide an employee ID to delete an employee record from employee table.

      <title>Delete a Record from MySQL Database</title>
         if(isset($_POST['delete'])) {
            $dbhost = 'localhost:3036';
            $dbuser = 'root';
            $dbpass = 'rootpassword';
            $conn = mysql_connect($dbhost, $dbuser, $dbpass);
            if(! $conn ) {
               die('Could not connect: ' . mysql_error());
            $emp_id = $_POST['emp_id'];
            $sql = "DELETE FROM employee WHERE emp_id = $emp_id" ;
            $retval = mysql_query( $sql, $conn );
            if(! $retval ) {
               die('Could not delete data: ' . mysql_error());
            echo "Deleted data successfully\n";
         }else {
               <form method = "post" action = "<?php $_PHP_SELF ?>">
                  <table width = "400" border = "0" cellspacing = "1" 
                     cellpadding = "2">
                        <td width = "100">Employee ID</td>
                        <td><input name = "emp_id" type = "text" 
                           id = "emp_id"></td>
                        <td width = "100"> </td>
                        <td> </td>
                        <td width = "100"> </td>
                           <input name = "delete" type = "submit" 
                              id = "delete" value = "Delete">