topic Re: Can merge() function be applied to dataframe? in Data Engineering

Can merge() function be applied to dataframe?

andrew0117 — Mon, 27 Mar 2023 04:04:50 GMT

if I have two dataframes df_target and df_source, can I do df_target.as("t).merge(df_source.as("s"), "s.id=t.id").whenMatched().updateAll().whenNotMatched.insertAll.execute().

when I tried the code above, I got the error "merge is not a member of the dataframe". If that is the case, what is the best way to do it? Thanks!

Re: Can merge() function be applied to dataframe?

pvignesh92 — Mon, 27 Mar 2023 10:43:04 GMT

Hi @andrew li Merge functionality is a part of Delta Lake API and not native dataframe API. Only when you are writing the data in delta format, you can use this functionality.

Please check the below link to achieve Merge using delta lake API.

https://learn.microsoft.com/en-us/azure/databricks/delta/merge

Re: Can merge() function be applied to dataframe?

Aviral-Bhardwaj — Mon, 27 Mar 2023 11:58:20 GMT

nice info

Re: Can merge() function be applied to dataframe?

Anonymous — Tue, 28 Mar 2023 04:10:57 GMT

Hi @andrew li

Hope all is well! Just wanted to check in if you were able to resolve your issue and would you be happy to share the solution or mark an answer as best? Else please let us know if you need more help.

We'd love to hear from you.

Thanks!

Re: Can merge() function be applied to dataframe?

pvignesh92 — Tue, 28 Mar 2023 08:22:54 GMT

@Aviral Bhardwaj Please upvote 🙂