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Helper I
Helper I

What does question marks after a fieldname mean ex: "record[field]?"

I've been trying to learn the the TripPin example by Microsoft and I noticed that there were times when they were adding question marks (?) after the fieldname. Is there any point to this? I've tried removing it, and it didn't seem to make any difference. 

 
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Super User III
Super User III

Re: What does question marks after a fieldname mean ex: "record[field]?"

Hi @PBIDevNoob ,

This prevents an error being risen if the field isn't included in your table. 

Instead a null will be returned for the missing column(s).

 

Imke Feldmann (The BIccountant)

If you liked my solution, please give it a thumbs up. And if I did answer your question, please mark this post as a solution. Thanks!

How to integrate M-code into your solution -- How to get your questions answered quickly -- How to provide sample data -- Check out more PBI- learning resources here -- Performance Tipps for M-queries

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Super User III
Super User III

Re: What does question marks after a fieldname mean ex: "record[field]?"

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Highlighted
Super User III
Super User III

Re: What does question marks after a fieldname mean ex: "record[field]?"

Hi @PBIDevNoob ,

This prevents an error being risen if the field isn't included in your table. 

Instead a null will be returned for the missing column(s).

 

Imke Feldmann (The BIccountant)

If you liked my solution, please give it a thumbs up. And if I did answer your question, please mark this post as a solution. Thanks!

How to integrate M-code into your solution -- How to get your questions answered quickly -- How to provide sample data -- Check out more PBI- learning resources here -- Performance Tipps for M-queries

View solution in original post

Highlighted
Helper I
Helper I

Re: What does question marks after a fieldname mean ex: "record[field]?"

Oh. That's nifty. Does Ms have any documentation on this? I've been looking everywhere online.
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Super User III
Super User III

Re: What does question marks after a fieldname mean ex: "record[field]?"

Highlighted
Helper I
Helper I

Re: What does question marks after a fieldname mean ex: "record[field]?"

You're a life saver. Thanks!

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