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I was told there would be no (date) math

I was told there would be no (date) math

2006-04-13       - By Mercadante, Thomas F (LABOR)

Reply:     1     2     3     4     5     6     7     8     9     10     >>  

Rich,

Well, logically, the first query returns a negative date.  

Time travel is not permitted in Larry-Land - not until he can find a way
to charge for it.

The second one returns todays date.

Tom

-- --Original Message-- --
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)] On Behalf Of Jesse, Rich
Sent: Thursday, April 13, 2006 9:52 AM
To: oracle-l@(protected)
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 (See ORA-00932.ora-code.com): 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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