Oracle LOWER

The Oracle LOWER() function converts all letters in a string to lowercase.

Syntax

The following shows the syntax of the Oracle LOWER() function:

LOWER(string)
Code language: SQL (Structured Query Language) (sql)

Arguments

The LOWER() function takes one argument:

1) string

is the string whose all characters are converted to lowercase.

Return value

The LOWER() function returns a string which all characters converted to lowercase.

Examples

The following example converts the string 'LOWER Function' to lowercase:

SELECT UPPER( 'LOWER Function' ) FROM dual;
Code language: SQL (Structured Query Language) (sql)

Here is the result:

'lower function'
Code language: SQL (Structured Query Language) (sql)

Let’s see the contacts table in the sample database:

contacts table

To search for contacts whose last name is Hill, HILL, or hill, you can use the LOWER() function in the WHERE clause as follows:

SELECT first_name, last_name, email FROM contacts WHERE LOWER( last_name ) = 'hill';
Code language: SQL (Structured Query Language) (sql)

Notice that the input value must be in lowercase to make query works as expected.

Here is the result:

Oracle LOWER function example

In this tutorial, we have shown you how to use the Oracle LOWER() function to convert all letters of a string to lowercase.

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