Re: BITAND need help (Solved)

The reason behind the oddity is probably that bitand() is defined (see standard.sql) to return a binary_integer (it used to return a number in earlier versions) and pure SQL does not recognise that type, so you need a method for coercing the result to a number.

It is probably slightly cheaper (though the point is moot) to use:

    to_number(bitand(x,y))
or cast(bitand(x,y) as number)
rather than invoking division.

More significantly, your post has highlighted an error I made a couple of days ago in a discussion about x$bh and tablescans.

I wrote:

    to_number(bitand(flag, power(2,19))) = 1 this should have been:

    to_number(bitand(flag, power(2,19))) = power(2,19)

(Of course, the answer I was looking for WAS
a 1, I'd just put it in the wrong place ;)

Apologies for any confusion I caused.

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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