RE: I was told there would be no (date) math
- From: "Igor Neyman" <ineyman@xxxxxxxxxxxxxx>
- To: <Rich.Jesse@xxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 13 Apr 2006 10:37:41 -0400
Could it be because "TRUNC(SYSDATE) - TRUNC(SYSDATE)" returns a NUMBER
type?
So, "TRUNC(SYSDATE) - (TRUNC(SYSDATE)" returns a NUMBER, and then you
subtract "TRUNC(SYSDATE)" which is DATE type. Obviously, this is not
allowed.
In the case with parenthesis:
"(TRUNC(SYSDATE) - TRUNC(SYSDATE))" returns a NUMBER, and then you
subtract it from "TRUNC(SYSDATE)" (which is DATE. And that is allowed
in "date arithmetic".
In other words you do:
DATE - NUMBER
but not:
NUMBER - DATE
Igor
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jesse, Rich
Sent: Thursday, April 13, 2006 9:52 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: I was told there would be no (date) math
Hey all,
While debugging an analytical function issue using 9.2.0.5, I run this
idiotic query:
SELECT TRUNC(SYSDATE) - TRUNC(SYSDATE) - TRUNC(SYSDATE) FROM DUAL;
And it errors out with:
ORA-00932: inconsistent datatypes: expected DATE got DATE
(In 10.2, the verbage is modified to "expected JULIAN DATE got DATE")
Add parenthesis and it works:
SELECT TRUNC(SYSDATE) - (TRUNC(SYSDATE) - TRUNC(SYSDATE)) FROM DUAL;
I've been looking through the docs and Metalink, but I'm unable to
answer "Why?". Anyone?
TIA!
Rich
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