MySQL - LIKE Clause MYSQL

A WHERE clause with the ‘equal to’ sign (=) works fine where we want to do an exact match. Like if "tutorial_author = 'Sanjay'". But there may be a requirement where we want to filter out all the results where tutorial_author name should contain "jay". This can be handled using the SQL LIKE Clause along with the WHERE clause.

If the SQL LIKE clause is used along with the % character, then it will work like a meta character (*) as in UNIX, while listing out all the files or directories at the command prompt. Without a % character, the LIKE clause is very same as the equal to sign along with the WHERE clause.

Syntax

The following code block has a generic SQL syntax of the SELECT command along with the LIKE clause to fetch data from a MySQL table.

SELECT field1, field2,...fieldN table_name1, table_name2...
WHERE field1 LIKE condition1 [AND [OR]] filed2 = 'somevalue'

• You can specify any condition using the WHERE clause.

• You can use the LIKE clause along with the WHERE clause.

• You can use the LIKE clause in place of the equals to sign.

• When LIKE is used along with % sign then it will work like a meta character search.

• You can specify more than one condition using AND or OR operators.

• A WHERE...LIKE clause can be used along with DELETE or UPDATE SQL command also to specify a condition.

You can use the similar syntax of the WHERE...LIKE clause into the PHP function – mysql_query(). This function is used to execute the SQL command and later another PHP function – mysql_fetch_array() can be used to fetch all the selected data if the WHERE...LIKE clause is used along with the SELECT command.

But if the WHERE...LIKE clause is being used with the DELETE or UPDATE command, then no further PHP function call is required.

Example

Try out the following example to return all the records from the tutorials_tbl table for which the author name contains jay −

<?php
   $dbhost = 'localhost:3036';
   $dbuser = 'root';
   $dbpass = 'rootpassword';
   $conn = mysql_connect($dbhost, $dbuser, $dbpass);

   if(! $conn ) {
      die('Could not connect: ' . mysql_error());
   }
   $sql = 'SELECT tutorial_id, tutorial_title, 
      tutorial_author, submission_date
      FROM tutorials_tbl
      WHERE tutorial_author LIKE "%jay%"';

   mysql_select_db('TUTORIALS');
   $retval = mysql_query( $sql, $conn );
   
   if(! $retval ) {
      die('Could not get data: ' . mysql_error());
   }

   while($row = mysql_fetch_array($retval, MYSQL_ASSOC)) {
      echo "Tutorial ID :{$row['tutorial_id']}  <br> ".
         "Title: {$row['tutorial_title']} <br> ".
         "Author: {$row['tutorial_author']} <br> ".
         "Submission Date : {$row['submission_date']} <br> ".
         "--------------------------------<br>";
   } 
   echo "Fetched data successfully\n";
   mysql_close($conn);
?>