What is the purpose of the replace function in Oracle?

The “REPLACE” function in Oracle is used to replace a specified substring in a string. It can find and replace all matching substrings in the string. The syntax of the REPLACE function is as follows:

REPLACE(original string, substring to be replaced, new substring)

Original string: The string to be replaced.
Sub-string to be replaced: The sub-string to be searched for and replaced in the original string.
Replacement sub-string: The sub-string to replace with.

For example, let’s say there is a table called “message” with a column named “content” that contains the string “Hello, world!”. We can use the REPLACE function to replace all commas with exclamation marks.

Replace all commas in the content field of the message table with exclamation points.

This will return “Hello! world!” as the output.