Value Associated With Max Value From Another Column

[alindquist]

I have two tables, a table of orders and a table of parts associated with those orders, with a many-to-one relationship; there can be many parts associated with a single order. Here is a sample set of data:

Orders

OrderNum

1

2

3

Parts

OrderNum	PartNum	Seq	ExpectedDate
1	ABC	1	10/10/2021
1	DEF	2	10/16/2021
1	GHI	3	10/13/2021
2	XYZ	1	10/17/2021
2	AAA	2	10/11/2021
3	BBB	1	10/10/2021
3	JKL	2	10/12/2021
3	ZZZ	3	10/12/2021

I have an measure like Max Expected Date = MAX('Parts'[ExpectedDate]) to determine the latest expected date for each order, which returns a table like:

OrderNum	Max Expected Date
1	10/16/2021
2	10/17/2021
3	10/12/2021

Now I would like to return the part number associated with that max expected date. If there are multiple parts with the same max expected date for a single order, then I want to return the part number with the lowest Seq value. For example, for order 3 there are 2 parts with an expected date equal to the max expected date, so I would need to return part JKL because of those two parts it has the lowest Seq value.

The desired output would be:

OrderNum	Max Expected Date	Max Expected Date Part Number
1	10/16/2021	DEF
2	10/17/2021	XYZ
3	10/12/2021	JKL

Thank you in advance.

[AlexisOlson]

There are quite a number of ways to do this.

https://stackoverflow.com/questions/52525377/return-top-value-ordered-by-another-column

I'm not sure what version is considered "best practice".

[parry2k · Accepted solution]

@alindquist here is the measure:

Latest Part = 
VAR __LatestExpectedDate = MAX ( Parts[ExpectedDate] )
VAR __EarliestSequence = CALCULATE ( MIN ( Parts[Seq] ), Parts[ExpectedDate] = __LatestExpectedDate )
RETURN
CALCULATE ( 
    MAX ( Parts[PartNum] ), 
    Parts[ExpectedDate] = __LatestExpectedDate, 
    Parts[Seq] = __EarliestSequence 
)

output

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[parry2k]

@alindquist for order #3, why you will have JLK, not ZZZ, both orders have the latest date? What is the logic to pick one over another?

[alindquist]

@parry2k I only want to return a single part. Logic in this case would be to select the part with the lowest Seq value. Part JKL and ZZZ both have a max expected date of 10/12/2021, so I would return JKL because it has the lower Seq value (2) compared to the Seq value for ZZZ (3).