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Replace Values in Power Query Using List Functions
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Tanya McIlravy
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July 26, 2022 - 12:59 am
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I need to fill in some holes in a query, but only a few so I don't want to use merge. I'd prefer to use lists with replace values function.

I have watched "VLOOKUP in Power Query Using List Functions" video but that is related to add columns.

 

I have two queries, and I just need to fill in nulls in one column (email) based on an ID that is in both queries. I am looking for a one-step solution
Table A
ID        Email
15        me@gmail.com
Table B
ID        Email
15        null
Desired Result
Table B
ID         Email
15         me@gmail.com
 
This is simplified, there are several more columns in Table B (and Table A).

Thanks.
TM

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Catalin Bombea
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July 27, 2022 - 2:54 pm
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Hi Tanya,

Here is the one step you wanted:

Custom1 = Table.FromRecords(Table.TransformRows(#"Changed Type",(rec)=>Record.TransformFields(rec,{"Email", each try if rec[Email]=null then Emails{List.PositionOf(IDList,rec[ID])} else rec[Email] otherwise null })))

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Tanya McIlravy
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July 28, 2022 - 12:12 am
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Thank you! I will reuse this a lot!

Should I also have a list buffer if there is a high row count?

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Catalin Bombea
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July 28, 2022 - 6:09 pm
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Sure, you can use List.Buffer on IDList and Emails lists, it should speed up processing.

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