The Replace function in SQL is used to update the content of a string. The function call is REPLACE( ) for MySQL, Oracle, and SQL Server. The syntax of the Replace function is:

Replace(str1, str2, str3): In str1, find where str2 occurs, and replace it with str3.

Assume we have the following table:

Table Geography

If we apply the following Replace function:

SELECT REPLACE(region_name, 'ast', 'astern')
FROM Geography;

Result: