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  3. March 2006

RE: Binary data types and some oddities

Yeah, this way the number will be exact, where using true binary decimals will almost always be an approximation. Ah, well, probably too much time on my hands. I still wonder about the HEX() function in SQL. For dates and times the true internal form is returned, as I understand it. Time is in 3 bytes, with each digit in a nybble. Dates are something called Scaliger or Julian days (number of days since something like January 1st, 4713 B.C.). So SQL handles those according to their true internal representation, where "fractional" binary numbers are not treated the same. Curious - might call it in. 

Thanks

At 10:27 PM 3/5/2006, you wrote:


Vernon,

I don't think there is anything particularly "odd" about what you are
seeing.

The B data type is converted internally (in most cases) to packed - which is
where your 12F comes from.  Although quite why SQL shows you the packed
version when you ask for the content in hex is anybody's guess.  But then
SQL does a lot of odd things.

Because of the packed conversion there is no need for the "funny numbers"
(sorry "binimals") you describe - the value is simply stored as an integer
and the scaling taken care of during conversion to packed.

True Integers (U and I in RPG) can't have decimals because they don't
implicitly get converted to packed.

Simple answer is don't sweat it - as long as the system gets the right
answer .....


Jon Paris
Partner400

www.Partner400.com
www.RPGWorld.com

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