Cast operator: Can a date be cast in to a number? Can someone provide an eg

Hi guys,
Can someone tell me if a date can be cast in to a number data type? I happen to come across a few lines of code that suggested it might be done.But when I tried it out it gives me an error
ORA-00932: inconsistent datatypes: expected DATE got NUMBER"
Would be helpful if anyone provided an example..
Thanks.

user8716986 wrote:
Hi,
Thanks for the responses..
Sorry about the operator part.. Guess gt a lil confused with C++ while googling..
What I am looking fr is to convert '01-JAN-95' to something like this 20120901 (the format I mean).Why not say
"convert '01-JAN-95' to *19950101* " or
"convert *'01-SEP-12'* to 20120901 " ?
The code that I came across goes something like this...
CREATE MATERIALIZED VIEW SUB
AS
SELECT cast(SCT as char (3)) SCT,
cast(EFFECTIVE_DATE as number (9)) EFFECTIVE_DATE,
cast(CANCEL_DATE as number (9)) CANCEL_DATE,
where EFFECTIVE_DATE and CANCEL_DATE are of DATE data type...
I know this can be done using TO_CHAR and TO_NUMBER.. i.e
TO_NUMBER((TO_CHAR(EFFECTIVE_DATE,'YYYYMMDD'))) EFFECTIVE_DATE,
TO_NUMBER((TO_CHAR(CANCEL_DATE,'YYYYMMDD'))) CANCEL_DATE,Why do you want NUMBERs in those columns? Why not VARCHAR2s (or even DATEs)?
I can understand wanting to have output in the desired format, so maybe (just maybe) that justifies converting the DATEs to VARCHAR2s, but why convert those VARCHAR2s to NUMBERs? The properties of NUMBERs don't apply to them. That is, the results you get from averaging those numbers, or adding another NUMBER to them, or subtracting them, just aren't meaningful: you're liable to get results like 20120055. It's true, you can sort and compare those NUMBERs, but you can sort and compare the corresponding VARCHAR2s (and the corresponding DATEs) just as well.
If you really have to convert the DATE to a NUMBER in that format for some reason, then what you posted above (TO_NUMBER (TO_CHAR ...)) is the right way to do it.
These stmts give me the desired results .. but what I still would like to know is how is that the above CAST stmts work while when I try them they don't.They don't work for me. I get "ORA-00932: inconsistent datatypes: expected NUMBER got DATE".

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Dynamic equivalent of the Java language CAST operator

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Here is what I want to do:
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The error is apearing due to casting taking place in Component Controller, could you please redirect me to fix it.
Error:
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Cast operator: Can a date be cast in to a number? Can someone provide an eg

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