How can I replace specific characters in a field with Oracle?

To replace specific characters in a field, you can use the REPLACE function in Oracle. The function takes three parameters: the original string, the character or substring to replace, and the character or substring to replace it with. Here is an example:

SELECT REPLACE('Hello, World!', 'Hello', 'Hi') AS new_string FROM dual;

This will return a new string “Hi, World!” where the original string “Hello” is replaced with “Hi”. You can use the REPLACE function in your query to replace characters in a field as needed.