Replace occurrences of a substring. This function replaces all instances of a specified search string within a string with a replacement string.
SELECT REPLACE('www.mariadb.org', 'w', 'Ww');
+---------------------------------------+
| REPLACE('www.mariadb.org', 'w', 'Ww') |
+---------------------------------------+
| WwWwWw.mariadb.org |
+---------------------------------------+