Data converted without format... What is that called?

Hello

I am fairly new to this forum, but made SQLs for the past 4 years.
I often see this "construction" that confuses me a bit:
SQL> select date '2010-02-01' d from dual;

D
-------------------
01/02/2010 00:00:00

SQL> select interval '3:15:20' hour to second i from dual;

I
---------------------------------------------------------------------------
+00 03:15:20.000000
I understand that it helps the user don't not to specify the input format data (even though I think that it is not not a good practice), but I don't know the name of this technique, and where, in the official documentation I can read more about it?

I would like to know things like:
-is it stuff, or only SQL SQL * more?
-What is the predefined entry format
-What version he did became available
-etc...

Check out this link.

http://download.Oracle.com/docs/CD/B19306_01/server.102/b14200/sql_elements003.htm#sthref365

Tags: Database

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