Calculated column

[TomSinAA]

What is the formula to create a calculated column using columns that have null values? 

If have three columns: A, B, C.  All three can have nulls.  I want to create a calculated column with the formula: (A+B) - C.  So something like:

If (A or B or C) is null then do not return a value else calculate (A+B) - C. 

[ChrisMendoza]

@TomSinAA -

Another option:

Column =
IF (
    TableName[A]
        && TableName[B]
        && TableName[C],
    CALCULATE (
        SUM ( TableName[A] )
            + SUM ( TableName[B] )
            - SUM ( TableName[C] )
    )
)

[edhans]

Use this.

New Column = 
IF(
    ISBLANK('Table'[Column1]) || ISBLANK('Table'[Column2]) || ISBLANK('Table'[Column3]),
    BLANK(),
    'Table'[Column1] + 'Table'[Column2] - 'Table'[Column3]
)

The || operator acts as an OR and can have unlimited numbers. The OR() function only allows 2, which won't work for your 3 column scenario. For AND() with unlimited, you would use &&. 

[TomSinAA]

Also, I tried just creating a column with the IF function. 

= Table.AddColumn(#"Changed Type", "Margin", each IF([#"J8B - SHP-Unscheduled"]=null, 0,[#"J8B - SHP-Unscheduled"]))

And it displays the following error: Expression.Error "The name 'IF' wasn't recognized. Make sure its spelled correctly."

[ChrisMendoza]

---

@TomSinAA wrote:

Also, I tried just creating a column with the IF function. 

= Table.AddColumn(#"Changed Type", "Margin", each IF([#"J8B - SHP-Unscheduled"]=null, 0,[#"J8B - SHP-Unscheduled"]))

And it displays the following error: Expression.Error "The name 'IF' wasn't recognized. Make sure its spelled correctly."

---

In this case 'IF' should be lowercase 'if' (Power Query). Shown as:

if 2 > 1 then  
    2 + 2   
else   
    1 + 1

[TomSinAA]

Here is the formula with the actual column names:

IF([#"J8B - SHP-Unscheduled"]) || ISBLANK([#"Y8B -STAT Processing Fee"]) || ISBLANK([Mvmt Cost]), BLANK(),
[#"J8B - SHP-Unscheduled"] + [#"Y8B -STAT Processing Fee"] - [Mvmt Cost])

It display a syntax error: Token eOF expected

With a ~ under the B in the second ISBLANK function

[edhans · Accepted solution]

Ahhh... the confusion is this is not a Calculated Column in the Power BI Desktop (DAX) side, but a Custom Column in Power Query. Totally different syntax.

Your formula should be:

= if [#"JB8 - SHP-Unscheduled"] <> null and [#"Y8B - STAT Processing fee"] <> null and [Mvmt Cost] <> null
then [#"JB8 - SHP-Unscheduled"] + [#"Y8B - STAT Processing fee"] - [Mvmt Cost] 
else null