Calculate column handling Null values

[kfschaefer]

Need to add 2 columns together, however one of the columns may contain a Null value and if Null the return the original value.

what is the proper syntax?  I need to add the Revenue columns and also the Cost columns together and if one is null the return the column that contains an actual value.

[Rickmaurinus]

There's plenty of ways to do it. I like the List.Sum option. But one could also catch the Nulls through conditional-if statements. Or one could also replace null by 0.  Take one that feels comfortable and if the performance is bad, try another. Also check out: 

3 Ways to SUM null values in Power Query 

Cheers,

Rick

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[MattAllington]

try this (case sensitive)

=if [column 1] = null then [column 2] else [column 1] + [column 2]

[Sean · Accepted solution]

@kfschaefer

select the column => Transform tab => Replace Values => Value To Find: null Replace With: 0

You may have do this step "Replaced Value" before the "Added Custom" where you add the 2 columns

[lolouk44]

Wherever possible I avoid changing data.

Try this instead:

each List.Sum({[ColA], - [ColB], [ColC]})

to perform ColA - ColB + ColC

My full line being:

= Table.AddColumn(#"Previous Step Name", "Sum", each List.Sum({[ColA], - [ColB], [ColC]}), Int64.Type)

[Wilhelm]

Very elegant solution - thanks!

[LP135]

This helped me a lot, @lolouk44

Thanks!

[Anonymous]

Thank you Lolo,

I will give it a try!

[Anonymous]

Hello,

I have tried this and it worked for the sum column, thank you.

However, I also need to add a custom column that concatenates those same number type columns (plus others that are text type), so for that I need to replace nulls with "" rather than "0", otherwise the custom column captures the "0" as a text, so it doesn't 'ignore' it. I have tried to sort this out (the type mix type problem) by using Text.From, but this function doesn't accept null values, since it returns null as long as one column contains null in that row... unless one of you guys come up with an easy solution I couldn't figure out I think I will up and turn to Excel (after the query) or DAX when I load to the model. Do you know where I could find a guide or in which language use for each case and in which order should the transformations be applied?

Many thanks in advance

Javier