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## Merge two tables while summing values from subtable

Hello, I have two tables

Table A is the Payment Table

 Payment ID Payment Amount Payment Date 1 10 1/1/17 2 10 1/2/17 3 10 1/3/17 4 10 1/4/17 5 10 1/5/17 6 10 1/6/17

Table B is the Refund Table

 Refund ID Payment ID Refund Amount Refund Date a 1 5 1/1/17 b 1 5 1/2/17 c 2 3 1/3/17 d 2 3 1/4/17 e 2 3 1/5/17 f 3 2 1/6/17

I would like to merge them together to get Table C which is the Payment Table (Table A) with the total refunds for each payment from the Refund Table (Table B) summed up into the new Refund Amount column

Table C - Required Result

 Payment ID Payment Amount Payment Date Refund Amount 1 10 1/1/17 10 2 10 1/2/17 9 3 10 1/3/17 2 4 10 1/4/17 0 5 10 1/5/17 0 6 10 1/6/17 0

Currently when I merge these I get the following which is wrong as it creates multiple payment ID rows for each refund amount.

 Payment ID Payment Amount Payment Date Refund Amount 1 10 1/1/17 5 1 10 1/1/17 5 1 10 1/1/17 3 2 10 1/2/17 3 2 10 1/2/17 3 3 10 1/3/17 2 4 10 1/4/17 0 5 10 1/5/17 0 6 10 1/6/17 0

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## Re: Merge two tables while summing values from subtable

Hi @jeffs9876,

According to your description above, adding a calculate column in Payment Table should be a better choice than merging the two tables in your scenario.

1. Create a relationships between the Payment table and Refund table with the Payment ID column if there isn't yet.

2. Then you should be able to use the formula below to add a new calculate column in Payment table to get the total refunds for each payment from the Refund Table.

`Refund Amount = CALCULATE(SUM(Refund[Refund Amount])) + 0`

Regards

2 REPLIES 2
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Microsoft

## Re: Merge two tables while summing values from subtable

Hi @jeffs9876,

According to your description above, adding a calculate column in Payment Table should be a better choice than merging the two tables in your scenario.

1. Create a relationships between the Payment table and Refund table with the Payment ID column if there isn't yet.

2. Then you should be able to use the formula below to add a new calculate column in Payment table to get the total refunds for each payment from the Refund Table.

`Refund Amount = CALCULATE(SUM(Refund[Refund Amount])) + 0`

Regards

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New Member

## Re: Merge two tables while summing values from subtable

Perfect! Thank you.

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