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I am trying to get the earliest call interaction, with only the agent that interacted at that call and the customer id. Using the following code, I still get duplicates:

select customer, agent, min(call)
from call_data;

I still get the following: enter image description here

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1 Answer 1

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This solved the problem:

select distinct on (customer)
customer, agent, min(call)
from call_data;

I am using PostgreSQL.

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