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Boycie92's avatar
Boycie92
Resolver I
8 years ago
Solved

Direct Query First and Last Dates

Hi   I’m wondering if someone can help,   I posted a topic a while ago about how to identify the First and Last Dates (link for further details):   http://community.powerbi.com/t5/Desktop/First...
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  • v-xjiin-msft's avatar
    v-xjiin-msft
    8 years ago

    Boycie92

     

    Then we need to create another new measure to calculate the count of productId.

     

    Count ProductId =
CALCULATE (
    COUNTROWS ( PowerBiTable1 ),
    FILTER (
        ALL ( PowerBiTable1 ),
        PowerBiTable1[ProductId] = MAX ( PowerBiTable1[ProductId] )
    )
)

    And the final measure will be:

     

    Identifier = 
IF (
    PowerBiTable1[Count ProductId] = 1,
    "Unique",
    IF (
        MIN ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[FirstTransactionDate],
        "First",
        IF (
            MAX ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[LastTransactionDate],
            "Last",
            BLANK ()
        )
    )
)

    Thanks,
    Xi Jin.

v-xjiin-msft's avatar
v-xjiin-msft
Solution Sage
8 years ago

Boycie92

 

Yes, it is not possible to use EARLIER, CALCULATE, LASTDATE and FILTER used in a calculated column. There exists a lot of limitations while using Direct Query as data source.

Please refer: DirectQuery Modelling limitations

 

Then to achieve your requirement, you should do some workarounds. Please refer to following steps:

 

1. Create two Measures to calculate the FirstTransactionDate and LastTransactionDate:

FirstTransactionDate =
CALCULATE (
    MIN ( PowerBiTable1[TransactionDate] ),
    FILTER (
        ALL ( PowerBiTable1 ),
        PowerBiTable1[ProductId] = MAX ( PowerBiTable1[ProductId] )
    )
)
LastTransactionDate =
CALCULATE (
    MAX ( PowerBiTable1[TransactionDate] ),
    FILTER (
        ALL ( PowerBiTable1 ),
        PowerBiTable1[ProductId] = MAX ( PowerBiTable1[ProductId] )
    )
)

 2. Create a Measure to get the identifier:

Identifier =
IF (
    MIN ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[FirstTransactionDate],
    "First",
    IF (
        MAX ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[LastTransactionDate],
        "Last",
        BLANK ()
    )
)

 

Thanks,
Xi Jin.

  • Boycie92's avatar
    Boycie92
    Resolver I
    8 years ago

    Hi v-xjiin-msft

     Thank you so much for getting back to me.

    Your solution works perfectly. However I have encountered an issue, that I hope you can help me with.

    I never realised that I was excluding products that has only been sold once.

    Can we edit the measures to say if the product ID appears once then its “Unique” if it appears Multiple times the first transaction (based on date) should say “first” and the last transaction (based on date) should say “Last”

    Thanks in advance,

    Boycie92

    • v-xjiin-msft's avatar
      v-xjiin-msft
      Solution Sage
      8 years ago

      Boycie92

       

      Then we need to create another new measure to calculate the count of productId.

       

      Count ProductId =
CALCULATE (
    COUNTROWS ( PowerBiTable1 ),
    FILTER (
        ALL ( PowerBiTable1 ),
        PowerBiTable1[ProductId] = MAX ( PowerBiTable1[ProductId] )
    )
)

      And the final measure will be:

       

      Identifier = 
IF (
    PowerBiTable1[Count ProductId] = 1,
    "Unique",
    IF (
        MIN ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[FirstTransactionDate],
        "First",
        IF (
            MAX ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[LastTransactionDate],
            "Last",
            BLANK ()
        )
    )
)

      Thanks,
      Xi Jin.

      • Boycie92's avatar
        Boycie92
        Resolver I
        8 years ago

        Hi v-xjiin-msft

         

        Thanks for the help.

         

        I have having an issue with the Identifier measure.

         

        MIN ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[FirstTransactionDate],
                "First",
                IF (
                    MAX ( PowerBiTable1[TransactionDate] ) = PowerBiTable1[LastTransactionDate],

         

        I get a red line at the bold parts of you formula. I looked at the error message and it says “a single value for column "" cannot be determined”

         

        Any ideas why?

         

        Thanks,

        Boycie92