What is the function of the Oracle REPLACE function?

The REPLACE function in Oracle is used to replace a substring within a string and return the modified result.

The syntax for the REPLACE function is as follows:
REPLACE(string, search_string, replace_string)

Description of parameters:

1. String: The string to be replaced.
2. search_string: the substring that needs to be replaced.
3. replacement_string: the string used for replacing.

The function of using the REPLACE function can achieve the following:

1. Replace a certain sub-string in a string with a specified string.
2. The REPLACE function can be called multiple times to perform multiple replacement operations.
3. If the search string appears multiple times in the string, it will be replaced entirely.
4. If the search_string is an empty string, all characters will be removed from the string.

SELECT ‘Hello, Oracle!’ AS result
FROM dual;

The outcome is: Hello, Oracle!