LOWER Function - SQL

Overview

The LOWER function in SQL converts all characters in a string to lowercase. It is useful for standardizing text to lowercase.

Example:

SELECT LOWER('Hello, WORLD')

Syntax:

SELECT LCASE(string_expression)

string_expression is the string you want to convert to lowercase.

Sample Data:

    
            department_id
            first_name
        
            3
            Frank
        
            2
            Jane
        
            3
            Ashley
        
            NULL
            Glenn
        
            2
            Kelly
        
            1
            Richard
        
            1
            George
        
            5
            Kyle
        
            2
            James
        
            1
            Gustavo

department_id	first_name
3	Frank
2	Jane
3	Ashley
NULL	Glenn
2	Kelly
1	Richard
1	George
5	Kyle
2	James
1	Gustavo

Example: Hard-coded value

In this example, we are returning the string ‘Hello, WORLD’ in all lowercase, the final output is ‘hello, world.’

Example: Query without the WHERE Statement

In this example, we are returning all of the rows in the first_name column in all lowercase.

Example: Query with the WHERE Statement

In this example, we are returning all of the rows in the first_name column in all lowercase where the department_id equals 1.