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nicoolai
Frequent Visitor

Using column from one query in source of another query

I have a query where one of the columns in the results, is a list of table names.

I want to query ANOTHER source, using the distinct values of those tables, as a filter.

I have created the filter by 

Text.Combine(List.Distinct(FromSourceA[TableName]), "|")

This gives me a string with every tablename, seperated by |'s to create a regex.

My problem is using this value in the query string of another source.

I keep getting "Formula.Firewall: Query 'QueryName' (step 'StepName') references other queries or steps and so may not directly access a data source. Please rebuild this data combination." error when I do this.

I have tried to follow the following guide but not really been able to make it work in any way (maybe because I have to use the variable string in another source):

https://excelguru.ca/power-query-errors-please-rebuild-this-data-combination/

 

Any ideas on how I can solve this?

1 ACCEPTED SOLUTION
dufoq3
Super User
Super User

Hi @nicoolai, you can also turn off the firewall. Check Ignore... in Privacy tab.

dufoq3_0-1713622387155.png

 


Note: Check this link to learn how to use my query.
Check this link if you don't know how to provide sample data.

View solution in original post

4 REPLIES 4
dufoq3
Super User
Super User

Hi @nicoolai, you can also turn off the firewall. Check Ignore... in Privacy tab.

dufoq3_0-1713622387155.png

 


Note: Check this link to learn how to use my query.
Check this link if you don't know how to provide sample data.

That only works in the desktop though.

lbendlin
Super User
Super User

Short answer: Don't do that. You will never get this past the formula firewall monster.

 

Long answer:  You need to keep everything inside a single partition, and you need to obfuscate your sources.  Lastly you may need to use Expression.Evaluate with scope bending.  (If these words sound like gibberish to you then I highly recommend you consume Ben Gribaudo's Primer.)

Thank you, that is some very good advice. I will go through that primer.

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