SQL> Syntax: REPLACE(<string_expression>, <search_string> [, <replacement_string>]) SQL> SQL> SQL> SELECT 2 REPLACE ('ABCDA', 'A','*') replace_A, 3 REPLACE ('ABCDA', 'A') remove_A, 4 REPLACE ('ABCDA',NULL) null_search 5 FROM dual; REPLA REM NULL_ ----- --- ----- *BCD* BCD ABCDA SQL> SQL>