Referencing joined table loading every time

Question

Hi,&nbsp;&nbsp;I have loaded two CSV and created two tables, and joined them as a Joined table.&nbsp;Every time I reference the Joined table, I see that CSV files are getting loaded again. Since those CSV files are very large, it loads for several minutes.&nbsp;&nbsp;How to avoid this, if there is a way?&nbsp;Thanks in advance.&nbsp;&nbsp;Regards,Myu

jennratten · Answer

Hello - are you performing the join as a new query or within an existing query? Joining as a new query should solve this problem. When the join is done within an existing query (the join is not the first step in the query), a separate call to the source is made for each row. I have included a link where this is explained in more detail.

https://docs.microsoft.com/en-us/power-query/optimize-expanding-table-columns#:~:text=When%20queries%20reach%20this%20bottleneck%2C%20the%20best%20mitigation,using%20the%20common%20key%20between%20the%20two%20tables.

myu2017 · Answer

Thank you for your help.&nbsp;I am actually merging with new query.&nbsp;As you can see from the screenshot above, whatever transformation/calculation I do in the "Not available in Oil" query, I see that the query is loading the CSVs again.&nbsp;&nbsp;

Forum Discussion

Referencing joined table loading every time

2 Replies

Related content

Join the Community!

conditional join

Spatial Join

Microsoft Load

Cannot Load Model