Count your top selling products with DAX

One of my customers wanted to count their top selling products. Since sharing is caring I will show you how this can be achived in this post 🙂

I want to list all products that sold for at least 5000 dollars in the year 2005.

DEFINE
    MEASURE 'Internet Sales'[Sales] =
        SUM ( 'Internet Sales'[Sales Amount] )
EVALUATE
        ADDCOLUMNS (
            FILTER (
                SUMMARIZE (
                    CROSSJOIN (
                        VALUES ( 'Date'[Calendar Year] ),
                        VALUES ( 'Product'[Product Id] )
                    ),
                    'Date'[Calendar Year],
                    'Product'[Product Id]
                ),
                'Internet Sales'[Sales] >= 5000
                    && 'Date'[Calendar Year] = 2005
            ),
            "Sum of Sales", 'Internet Sales'[Sales]
) ORDER BY 'Internet Sales'[Sales] DESC

And the result will look like this

Top selling 1

If you want to only display the number of products you can add “row” and “countrows” like this

DEFINE
    MEASURE 'Internet Sales'[Sales] =
        SUM ( 'Internet Sales'[Sales Amount] )
EVALUATE
ROW (
    "Count", COUNTROWS (
        ADDCOLUMNS (
            FILTER (
                SUMMARIZE (
                    CROSSJOIN (
                        VALUES ( 'Date'[Calendar Year] ),
                        VALUES ( 'Product'[Product Id] )
                    ),
                    'Date'[Calendar Year],
                    'Product'[Product Id]
                ),
                'Internet Sales'[Sales] >= 5000
                    && 'Date'[Calendar Year] = 2005
            ),
            "Sum of Sales", 'Internet Sales'[Sales]
        )
    )
)

And the result will look like this

Top selling 2

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Basic query optimalization in DAX

What can we do to make queries as fast as possible? Here is some tips 🙂

In my simple test I want to see the sales for year 2009. To make sure my queries does not hit any cache I’m clearing it using XMLA. In my first query I will try to use the ROW function and sum up the internet sales

EVALUATE
ROW (
"Sales", CALCULATE (
SUM ( 'Internet Sales'[Sales Amount] ),
'Date'[Calendar Year] = 2008
)
)

When watching the profiler I can see that this query took 156 milliseconds. The reason why this takes quite long is that we are one the row level.

Lets switch to table level.

EVALUATE
FILTER (
SUMMARIZE (
'Date',
'Date'[Calendar Year],
"Sales", SUM ( 'Internet Sales'[Sales Amount] )
),
'Date'[Calendar Year] = 2008
)

This query took 78 milliseconds. Twice as fast as the first query.

What if I move the calculation using ADDCOLUMNS outside the SUMMARIZE?

EVALUATE
ADDCOLUMNS (
FILTER (
SUMMARIZE ( 'Date', 'Date'[Calendar Year] ),
'Date'[Calendar Year] = 2008
),
"Sales", CALCULATE ( SUM ( 'Internet Sales'[Sales Amount] ) )
)

This query took 62 milliseconds

Do you have an even better optimalization tip? Feel free to drop me an mail