MySQL Lowercase in Where Clause

The LOWER() function in SQL language allows you to transform all uppercase characters in a string into lowercase. This function can therefore be useful to present results in a certain way.

Warning: you should probably pay attention to the encoding used. With MySQL, the function uses by default the ISO 8859-1 Latin1 set.
 

 

Syntax:

The syntax of a query using this SQL function is as follows:

SELECT column1, column2, ....
FROM table_name
WHERE LOWER(column1) = 'value-in-lowercase'

 

Example :

Let’s suppose an application with users. This application uses a table that stores the name, age, and address of each user.
 
Users Table:

+----------+-----------+--------+-------------------------------+
|  userID  |    name   |  age   |             address           |
+----------+-----------+--------+-------------------------------+
|    101   |   ALEX    |   25   | 819 Saint Francis Way         |
|    102   |   EMILY   |   15   | 171 Jarvisville Road Michigan |
|    103   |   JEAN    |   35   | 188 Clay Street Indiana       |
|    104   |   BOB     |   40   | 285 Java Lane Missouri        |
+----------+-----------+--------+-------------------------------+

 

 

Search for a name in lower case

Let’s suppose that the user is looking for a name using lowercase letters and we know that the table stores names in uppercase. In order to find a user from his name in lower case, it would be enough to use the LOWER() function in WHERE clause, like this:

SELECT userID, name, age, address
FROM users
WHERE LOWER(name) = 'jean'

Output:

+----------+-----------+--------+-------------------------------+
|  userID  |    name   |  age   |             address           |
+----------+-----------+--------+-------------------------------+
|    103   |   JEAN    |   35   | 188 Clay Street Indiana       |
+----------+-----------+--------+-------------------------------+

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