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Editorial Team
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Asked: 2026-05-21T02:59:55+00:00

I have a database in which I store product sales. My sales table is

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I have a database in which I store product sales. My sales table is made up of the following fields: [saleID], [itemCode], [Date], [storeID], [quantitySold]. The problem is I want the user to be able to insert a payment for multiple saleIDs.

Prices come from the items table but there may be a discount if multiple items are purchased. I want to be able to store a finalPayment field and multiple sales connected to it, then group the sales by the specific finalPayment. However there could be same sum finalPayments that do not belong to the same sales batch so I cannot group by finalPayment as a field in the sales table.

I could create a finalPayments table and every time a multiple item sale and discount is made, store a new final payment in it, retrieve the last finalPaymentID and then store it in the sales table (in a new field [finalPaymentID] that I will create) for every sale that belongs to it. Then i could group sales by finalPaymentID.

Could the last finalPaymentID in the table be created by some other store? Can there be a concurrency problem? Do I need to lock the table in some way until the finalPaymentID is retrieved and stored in the sales table? How would you implement this?

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1 Answer

  1. Editorial Team

    I actually did with the payments table. I used
    string insertSQL = “INSERT INTO [payments ] ([paymentSum]) VALUES (@paymentSum);SELECT @@Identity”;

    and then stored the paymentID retrieved into the sales table for each sale that is part of the batch.

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