a
, b
and c
have the same value, x
is different. create synonym tq84_dual for dual; select sys.dbms_sqltune_util0.sqltext_to_signature('select * from dual') a, sys.dbms_sqltune_util0.sqltext_to_signature('SELECT * FROM DUAL') b, sys.dbms_sqltune_util0.sqltext_to_signature('SELECT * ' || chr(10) || ' from dual') c, sys.dbms_sqltune_util0.sqltext_to_signature('SELECT * FROM tq84_dual') z from dual;