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Concat Distinct rows into a single string

Hi,

In my table I have rows like this

Table Name : Test

Name

-----------------------

sam

khan

sun

sam

My query

Select string_agg(Name,',') from Test

Output

sam,khan,sun,sam

But it is giving Duplicate values like sam comes twice.

Please help me to Eliminate duplicates while using string_agg function

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1 Answer

  • Posted on Nov 14, 2014 at 12:53 PM

    You might be successful if you tell SAP HANA that you want the duplicates to be eliminated.

    select string_agg_name,',') from

    ( select distinct name from test

    )

    You might be careful though when your inner select contains an aggregation already. Then the SAP HANA optimizer can find the DISTINCT to be disposable...

    But that's problem to deal with when you face it 😊

    - Lars

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