Column data reading according to the number of lines

Hi guys,.

I am currently stuck on the problem of recovering the data from my database (MS Access) according to the number of lines, he has at any time (without having to know how many lines there will be during the programming of this part).

First, I show how my program works. I'm working on an automated food, order and after the customer has chosen his power, system information such as the name of the food, quantity and price of the food will be written to the MS Access database table. (for example table name "Orderingtable" in MS Access) For my case, 1 order of food will occupy 1 line of the database table. In other words, as part of the same, if he orders 3 different foods, 3 rows will be filled in my database table.

I would then get the part number of 'Quantity' for each order of the database and summarize the amount finally to count the total number of orders in the table of database at any time. This addition of result will be then shown on the Panel before informing the customer how many orders waiting's just prior to his order. In this case, it can get out if he wants to, if the number of orders is too big for its waiting time.

However, I do not know how many lines my 'Orderingtable' will be 'Orderingtable' because both accumulate lines and data lines until being command to remove. Therefore, I cannot predict how many lines I program the party totals the number of quantity for each line.

Is it possible that I can get the part of the 'quantity' without having to know the number of rows in the database so that I can count the total number of pending orders just by adding up the value of the quantity for each line?

I do not wish to "code" my program by limiting the tables of database for us are going to say, only 50 lines at any time.

Attached below, this is how my database table "Orderingtable" looks at, which will be used to extract the 'Quantity' column so that it can count the total number of orders and be shown/shown on the front panel of my Labview program.

I hope that you are able to help me!

Thank you so much in advance.

See you soon,.

MUI

You can also use the SUM function:

SELECT SUM (Quantity) OF the order WHERE Queue_No = %d

And no need of an "Order By" clause, if you add just the quantities.

Tags: NI Software

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