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# Comparing Data What's the best way?

## Comparing Data What's the best way?

(OP)
I have two tables. They both contain the field "InvoiceNumber". Table A has 1 record for "InvoiceNumber". Table B has multiple records for "InvoiceNumber". Both also have an "Amount" field and a "Quantity" field. I am trying to compare the "Amount" and "Quantity" fields for the matching records from each Table. Obviously the data from Table B will have multiple records and will need to be summed before they are compared.
I will also need to verify table B has at least one matching record for each record in table A.

Any idea on the best way to accomplish this?

### RE: Comparing Data What's the best way?

Do you have a relation establieshed between Table A (parent) and Table B (child) based on PK-FK (one-to-many) of InvoiceNumbe?

And, if a records in Table B has 10, 12, and 15 for Quantity, do you have to have Quantity in Table A of the sum of 10, 12, and 15?

Have fun.

---- Andy

A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station.

### RE: Comparing Data What's the best way?

(OP)
Yes, I have a relationship established.
Quantity (one record) in Table A should match the sum of quantity (multiple records) in table B.
We have a customer that pays our invoices on separate line items. we only use one line to invoice. I am working on a method to reconcile the two.

### RE: Comparing Data What's the best way?

So it looks to me you are looking for Parent records (Table A) that do not have children records (Table B)

In Oracle I would try:
Select InvoiceNumber From TableB
MINUS
Select InvoiceNumber From TableA

I hope you can do the same in Access

or (this will work in Access)

Select InvoiceNumber From TableA
Where InvoiceNumber NOT IN (
Select InvoiceNumber From TableB)

But – in my opinion, it is very bad idea to have calculated fields in your DB.
By ‘calculated’ I mean: you have 10-12-15 in one table, and a Sum of it in another. Why….?

Have fun.

---- Andy

A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station.

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