Mysql RPAD() function ~ Tech Blog

Mysql RPAD() function

MySQL RPAD() function pads strings from right. The actual string which is to be padded, the length of the string returned after padding and string which is used for padding - all these are passed as arguments.

Syntax:

RPAD(str, len, padstr)

Arguments

Name	Description
str	The actual string which is to be padded.
len	Length of the string returned after padding.
padstr	String which will be used for padding.

Pictorial Presentation

Example : MySQL RPAD() function

The following MySQL statement returns a string after right padding with the string ‘*’ to a length of 15 characters.

Code:

SELECT RPAD('w3resource',15,'*'); 



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Sample Output:

mysql> SELECT RPAD('w3resource',15,'*'); 
+---------------------------+
| RPAD('w3resource',15,'*') |
+---------------------------+
| w3resource*****           | 
+---------------------------+
1 row in set (0.00 sec)

Example of MySQL RPAD() function specifying shortened length

The following MySQL statement returns a string which is shortened because the string is longer than the total length mentioned in the second argument.

Code:

SELECT RPAD('w3resource',6,'*'); 



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Sample Output:

mysql> SELECT RPAD('w3resource',6,'*'); 
+--------------------------+
| RPAD('w3resource',6,'*') |
+--------------------------+
| w3reso                   | 
+--------------------------+
1 row in set (0.00 sec)

Example of MySQL RPAD() function to right padding

The above MySQL statement returns the column aut_name and the aut_name with right padding by the character ‘*’ to the length of 25 characters from the table author for those rows which have the column value of country as ‘UK’.

Code:

SELECT aut_name,RPAD(aut_name,25,'*')
FROM author 
WHERE country='UK';
              


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Sample table: author

Sample Output:

mysql> SELECT aut_name,RPAD(aut_name,25,'*')
    -> FROM author 
    -> WHERE country='UK';
+-----------------+---------------------------+
| aut_name        | RPAD(aut_name,25,'*')     |
+-----------------+---------------------------+
| William Norton  | William Norton*********** | 
| William Anthony | William Anthony********** | 
| Piers Gibson    | Piers Gibson************* | 
| C. J. Wilde     | C. J. Wilde************** | 
+-----------------+---------------------------+
4 rows in set (0.00 sec)

PHP script

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example-rpad-function - php mysql examples | w3resource</title>
<meta name="description" content="example-rpad-function - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>A list of Authors those who belong to UK. Second column shows a string by right padding by the character '*' to length of 25 characters of the Author's name:</h2>
<table class='table table-bordered'>
<tr>
<th>Author's name</th><th>RIGHT(aut_name,7)</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT aut_name,RPAD(aut_name,25,"*") as output
FROM author
WHERE country="UK"') as $row) {
echo "<tr>";
echo "<td>" . $row['aut_name'] . "</td>";
echo "<td>" . $row['output'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>



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Tech Blog

Tuesday 10 July 2018