Simple Dates Subtraction

Hello guis, i'm new here. I'm studying for iz0-051 certification exam and I would really appreciate if you can help me out with this doubt i have..
I know that a character literal can be implicitly converted to a date if it follows the mask '[dd,DD] separator [mm,MM,Mon] separator [yy,rr,yyyy] etc..etc...
then.. why doesn't this simple subtraction go through (number of days between a certain date and the current sysdate)?
select sysdate - '01-jan-2012' from dual;
it gives "ora-01722 invalid number" error, shouldn't it implicitly convert the literal to a date and then subtract it from sysdate? what am I doing wrong?
thanks for your help,
Paolo

Welcome to the forum.
(Don't forget to read the SQL and PL/SQL FAQ @ https://forums.oracle.com/forums/ann.jspa?annID=1535)
Oracle isn't considering implicit conversion that way (and that's a good thing).
You should never rely on implicit datatype conversions.
SQL> select sysdate - '01-jan-2012' from dual;
select sysdate - '01-jan-2012' from dual
ERROR at line 1:
ORA-01722: invalid number
SQL> select sysdate - to_date('01-jan-2012') from dual;
SYSDATE-TO_DATE('01-JAN-2012')
239.59963The other way around will not work either:
SQL> select '01-jan-2012' - sysdate from dual;
select '01-jan-2012' - sysdate from dual
ERROR at line 1:
ORA-00932: inconsistent datatypes: expected CHAR got DATEThe documentation will tell you more details if you want to know:
http://docs.oracle.com/cd/E11882_01/server.112/e26088/sql_elements002.htm#g195937

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