topic Re: Objective is to make table unique at ID using group by , concat_ws and collect_list ,combining distinct values in one row. in Data Engineering

Objective is to make table unique at ID using group by , concat_ws and collect_list ,combining distinct values in one row.

Anonymous — Wed, 08 Feb 2023 11:45:09 GMT

Objective is to make table unique at ID. Table structure is as in attached image.

Query used is :

select

ID,

concat_ws(' & ' , collect_list(Distinct Gender)) as Gender

from table

group by ID

It can be possible if we can order values within collect_list and then concat but I can't figure out how to do that.

@Hubert Dudek @Werner Stinckens @Aviral Bhardwaj @Hemanth A @Omkar G @Yogita Chavan @Gam Nguyen @Aman Sehgal @Ajay Pandey @pat @Hau Nguyen

Re: Objective is to make table unique at ID using group by , concat_ws and collect_list ,combining distinct values in one row.

Aviral-Bhardwaj — Wed, 08 Feb 2023 12:04:25 GMT

use split or Explode here ,it will work

Re: Objective is to make table unique at ID using group by , concat_ws and collect_list ,combining distinct values in one row.

-werners- — Wed, 08 Feb 2023 12:27:14 GMT

Does this help?

https://stackoverflow.com/questions/46580253/collect-list-by-preserving-order-based-on-another-variable

https://stackoverflow.com/questions/59782602/groupby-and-collect-list-maintaining-order-based-on-another-column-in-pyspark

Re: Objective is to make table unique at ID using group by , concat_ws and collect_list ,combining distinct values in one row.

Anonymous — Wed, 08 Feb 2023 12:37:17 GMT

here I have to join multiple values in one row. Split and explode will be used when we have to convert list/array into different rows

Re: Objective is to make table unique at ID using group by , concat_ws and collect_list ,combining distinct values in one row.

Anonymous — Mon, 10 Apr 2023 08:37:37 GMT

Hi @Rishabh Shanker

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