REPLACE function returns a string that every occurrence of the pattern_to_find is replaced with pattern_to_replace_by.
The general format for this function is:
REPLACE(source_string, pattern_to_find, pattern_to_replace_by)
SQL> SQL>-- w w w .ja v a2s . c om SQL> SELECT REPLACE('Mississippi', 'pi', 'PI') FROM dual ; REPLACE('MI ----------- MississipPI SQL>