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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 Ken Naim

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

When you subtract two dates you get a number and sql follows order of
operations so it goes from left to right.

Trunc(sysdate)- Trunc(sysdate) - Trunc(sysdate) becomes
1- trunc(sysdate) which throws the error as you cannot subtract a date from
a number

With the parenthesis the way you have it you start with
TRUNC(SYSDATE) - (TRUNC(SYSDATE) - TRUNC(SYSDATE)) which becomes
TRUNC(SYSDATE) - 1 which is fine.

If you would switch the parenthesis to
(TRUNC(SYSDATE) - TRUNC(SYSDATE)) - TRUNC(SYSDATE) you would get the same
error as it would become 1- trunc(sysdate)

Ken Naim




-- --Original Message-- --
From: oracle-l-bounce@(protected) [mailto:oracle-l-bounce@(protected)]
On Behalf Of Jesse, Rich
Sent: Thursday, April 13, 2006 8:52 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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