Merging Tables - Power Query Editor Tips and Tricks

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In this video, you'll learn a cool hidden trick for merging tables in Power Query Editor, a powerful data transformation and cleansing tool in Excel and Power BI. Whether you need to combine data from multiple sources, match records based on common columns, or reshape your data into a new format, these tips and tricks will help you save time and improve the quality of your analysis.
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Can't you just remove the duplicates from Customer Lookup table in the email field before you merge them. That would solve the issue you are trying to solve. As we know in a lookup table, we shouldn't have duplicates, is that correct?

pthapa
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Ohh this is really nice.
To solve the duplication I used a Nested Add Custom Columns (X let in +Add Custom Column + New Custom Column .... Each one with a combination of List.Distinct + Text.Combine).

This is def. more user friendly.

rulec
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Thanks Mitch. I have done hundreds merges and never observed that. Did you try it on a relatively large data by any chance? I tried it and it was very slow when I tried to expand the table .

decentmendreams
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Can you Please explain how do you merge the tables of sem1 AND sem2

Rahmankhan-ffqh