Why does NOT() prevent converting boolean to numerical values? DAX Mysteries

[edhans]

In the above image, I can convert the True/False in the [Value] column to a number by multiplying by 1. Great.

However, as shown above, if I wrap [Value] with NOT(), thus changing true to false and false to true, I can not convert it to a number by multiplying by 1. It stays as a true/false value.

Why is that? What am I missing?

[Anonymous · Accepted solution]

Hi @edhans 

I followed your steps and got the same result.

What I noticed is that the data type still remained "True/False" instead os changing to Whole number unlike for "Column".

Changing it to Whole number serves the purpose.

As to why it is behaving in such way still might be a question as it follows the similar construct as "Column".

This might have to do with how Power BI internally finalises the data type.

[Anonymous · Accepted solution]

Hi @edhans 

I followed your steps and got the same result.

What I noticed is that the data type still remained "True/False" instead os changing to Whole number unlike for "Column".

Changing it to Whole number serves the purpose.

As to why it is behaving in such way still might be a question as it follows the similar construct as "Column".

This might have to do with how Power BI internally finalises the data type.

[edhans · Accepted solution]

Interesting @Anonymous - good catch on the data type. I also found out that if I used it as an operator and not as a function it works without having to change the data type.

And, of course, I hit this behavior inside of a measure where you cannot change the data type, nor could you deeper in a more detailed function even inside of a calculated column. But good thinking!