dbadmin@mutation_mutation > create table test(c1 number);

Table created.

dbadmin@mutation_mutation > insert into &tname values (1);
Enter value for tname: test
old   1: insert into &tname values (1)
new   1: insert into test values (1)

1 row created.

dbadmin@mutation_mutation > /
Enter value for tname: test
old   1: insert into &tname values (1)
new   1: insert into test values (1)

1 row created.

dbadmin@mutation_mutation > select * from test;

        C1
----------
         1
         1