MySQL LOWER() function

LOWER() function

MySQL LOWER() converts all the characters in a string to lowercase characters.




Name Description
str A string whose characters are going to be converted to lowercase.

Syntax Diagram:

MySQL LOWER() Function - Syntax Diagram

MySQL Version: 5.6

Video Presentation:

Example: MySQL LOWER() function

The following MySQL statement returns the given string after converting all of its characters in lowercase.



Sample Output:

| myteststring          | 
1 row in set (0.01 sec)

Example of LOWER() on column of a table

The following MySQL statement returns those rows from the publisher table whose publishers does not belong to the USA. The column pub_name and after converting the pub_name column in lowercase is displayed in the output.


SELECT pub_name,LOWER(pub_name) 
FROM publisher 
WHERE country<>'USA';

Sample table : publisher

Sample Output:

mysql> SELECT pub_name,LOWER(pub_name) 
    -> FROM publisher 
    -> WHERE country<>'USA';
| pub_name                     | LOWER(pub_name)              |
| BPP Publication              | bpp publication              | 
| New Harrold Publication      | new harrold publication      | 
| Ultra Press Inc.             | ultra press inc.             | 
| Pieterson Grp. of Publishers | pieterson grp. of publishers | 
| Novel Publisher Ltd.         | novel publisher ltd.         | 
5 rows in set (0.00 sec)

PHP script:

<!doctype html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>example lower function - php mysql examples | w3resource</title>
<meta name="description" content="example lower function - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>List of publishers those who don't belong to USA. Right column shows the name of of the Publisher in lowercase:</h2><table class='table table-bordered'><tr>  
<th>Publishers name</th><th>Publishers name in lowercase</th>
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT pub_name,LOWER(pub_name)
FROM publisher 
WHERE country<>"USA"') as $row) {
echo "<tr>";
echo "<td>" . $row['pub_name'] . "</td>";
echo "<td>" . $row['LOWER(pub_name)'] . "</td>";
echo "</tr>"; 

View the example in browser

JSP script:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<!DOCTYPE html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
try {
String Host = "jdbc:mysql://localhost:3306/w3resour_bookinfo";
Connection connection = null;
Statement statement = null;
ResultSet rs = null;
connection = DriverManager.getConnection(Host, "root", "datasoft123");
statement = connection.createStatement();
String Data ="SELECT pub_name,LOWER(pub_name) FROM publisher WHERE country<>'USA'";
rs = statement.executeQuery(Data);
<TABLE border="1">
<tr width="10" bgcolor="#9979">
<td>Publishers name</td>
<td>Publishers name in lowercase</td>
while (rs.next()) {
<%   }    %>
} catch (Exception ex) {
out.println("Cant connect to database.");

Online Practice Editor:

All String Functions

MySQL String Functions, slide presentation

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