a Challenge for me

i reallly appreciate your help thanks for all of you but still let make it
more clear i am not satisfied what i want ....... let make it more clear i
will have two tables; one for purchases and the second for sales to give you
the idea about the stock .

for example [purchases table]

SNO Item Serial Starts
Serial Ends

1 Talk Home 87564561
87565060


so the above stock is 500 cards with me in stock lets supppose i sold the
following 60 cards randomly in [sale table ] such as

SNO Item Serial Starts
Serial Ends

1 Talk Home 87564581
87564590
2 Talk Home 87564640
87564690


however there are two transaction now in the sale table where in the first
transaction i sold 10 cards while in the second transaction i sold 50 cards
so the question is that how i would know in the system that which cards
serial number are in my hand when slowly i sale more cards.
hopefully it is more clear now

thankx in advance

"Fred" wrote:

Dear Naveed,

I believe that I do understand what you are saying. And, if you will
forgive me, that I may have thought through the possibilities within what you
are saying more than you have, and so might understand what you are asking
even better than you do. :-)

Is this correct:

You are saying that you typically start with a group opf items of the same
type, but each with a different serial number, and typically a set of
sequential serial numbers. And that any one of these items may get sold
/removed. (e.g you can't dictate that they take the lowest or highest serial
number.)

And, you have given us an example, where someone has taken one out of the
series and want the datebase to show you whic ones are still in stock. And
since the PARTICULAR example that you have in mind (just one missing) is
where the missing one is an exception, you are imaging a system which will
serve for that example, I.e. to say "1 through 87" and 89 thought 100" are in
stock. And so you are imaging some systems that will base it's answer
based on where the (one) "gap" is. You probably haven't thought about the
more complex scenerios, e.g where someone has removed the following serial
numbers: 3,5,8,11, 22-29, 35, 39, 45--49. 51. 55.56. 61, 70-75, 85,86,
93, 94. And, you have probably made the common error of thinking that this
can be solved without starting from the ground up by desigin a table
structure that will support accomplishing what you are trying to do. I.E.
making the mistake that you can skip this table structure step and go right
to the finish line of what you seek via some query or form action.

If all of my guesses are correct, then my previous post would give you a
foundation that would be a good starting point for solving this. More
work would be needed after that, but it would be a foundaiton.