SQL LOWER() function

LOWER() function

The SQL LOWER() function is used to convert all characters of a string to lower case.

Syntax:

LOWER(string)

PostgreSQL, MySQL, SQL Server and Oracle

All of above platforms support the SQL syntax of LOWER().

Parameters:

Visual Presentation:

Application of LOWER()

In the subsequent pages, we have discussed how to apply LOWER() with various SQL clauses. we have used Oracle 10g Express Edition.

Example:

If we want to get the string 'TESTING FOR LOWER FUNCTION' in lower case from the DUAL table, the following SQL statement can be used :

-- This SQL query converts a given string to lowercase using the LOWER function and returns the result with an alias.
-- SELECT statement begins
SELECT 
    LOWER('TESTING FOR LOWER FUNCTION') -- Convert the given string 'TESTING FOR LOWER FUNCTION' to lowercase
    AS Testing_Lower -- Alias the result of the lowercase conversion as 'Testing_Lower'
FROM 
    dual; -- Dual is a dummy table in Oracle, used here as a placeholder since we're not actually querying any table

Explanation:

• This SQL code is a SELECT statement that demonstrates the use of the LOWER function to convert a string to lowercase.


• The string 'TESTING FOR LOWER FUNCTION' is passed as an argument to the LOWER function.


• The result of the conversion is then given an alias 'Testing_Lower'.


• The query is executed against the dummy table 'dual', which is commonly used in Oracle databases when you want to perform a calculation or evaluate an expression without actually querying a specific table.

Output:

TESTING_LOWER
--------------------------
testing for lower function

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