Change constant number
SQL> SQL> -- change constant number SQL> SQL> declare 2 myconstant constant number := 50; 3 begin 4 myconstant := 51; 5 end; 6 / myconstant := 51; * ERROR at line 4: ORA-06550: line 4, column 5: PLS-00363: expression 'MYCONSTANT' cannot be used as an assignment target ORA-06550: line 4, column 5: PL/SQL: Statement ignored SQL>