Distinct inside a calculate function

[mp390988]

Hi,

I was going through a question on the PL300 exam and noticed the solution has explicitly written a distinct as the first argument of a calculate function as marked in the snippet below. I didn't even know this was possible as my understanding is that the distinct returns a column and the first argument of a calculate should be a scalar expression not a table expression. Furthermore, all of this is meant to be inside a calculated column as the question mentions this so how does each row of a calculated column store a table expression?

Original Question:

SOLUTION - please see where I have marked in yellow.

It just seems so odd but it seems to work as I tested it. Maybe it works because only 1 value is being returned by the distinct inside here:

var Result = CALCULATE(DISTINCT(transaction Size[Transaction Size]), FilterSegment)

Thanks,

[v-echaithra]

Hi @mp390988 ,

Thank you @OwenAuger  for your input.

We’d like to follow up regarding the recent concern. Kindly confirm whether the issue has been resolved, or if further assistance is still required. We are available to support you and are committed to helping you reach a resolution.

Best Regards,
Chaithra E.

[OwenAuger]

Hi @mp390988 

You've hit the nail on the head 🙂 A single-column table with at most one row is treated as a scalar value if the context requires. In the case of zero rows, the value returned is BLANK.

See here.

In this case, the configuration of the 'Transaction Size' table ensures that the result will have at most one row.

If 'Transaction Size' were misconfigured and had rows with overlapping [Min,Max] ranges, this expression for Sales[Transaction Size] could result in an error.