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

region_name	store_name
East	Boston
East	New York
West	Los Angeles
West	San Diego

If we apply the following Replace function:

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

Result:

region_name

Eastern

Eastern

West

West

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