check if value contains in another table

[froxas]

I have "clien's" table with client_id, and i have another table "invoices" where each invoice has client_id.

with power query I need to add in "client's" table column yes/no  to check if every client are in "invoice" table.

wih the excel it would be simple lookup. how i can do it.

i tried with Table.Contains but did not suceeded.

[mdutot]

For quick fixes, I merge queries on a common column and then write a custom column that replaces "null" with "no" and everything else with "Yes" 

Merge "Clients" query and "Invoices" queries on Client-ID.

Expand any Client-ID column
CustomColumn = if [#"Client-ID"] is null then "No" else "Yes"

[Pablinho]

This is the actual solution! Thank you so much! This is my first time doing the expand but it worked as a charm! Thank you!

[PradeepDive]

Did you try merge query 

[artemus · Accepted solution]

Add a custom column with:

= List.Contains(InvoiceTable[client_id], [client_id])

Where InvoiceTable  is the query name of your invoice table.

[MarkPalmberg]

I implemented this between two tables with fewer than 30K rows each and got a pretty substantial performance hit when going to apply changes, FWIW.

[Anonymous]

Agreed, I tried this with ~150k rows, and it's unusable. Very good for small datasets though

[Anonymous]

HowardLJ - did you find a workaround for large datasets?