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Since 1.16.0 This returns the smallest values seen by the aggregate and the corresponding values associated with them. Note that Postgres requires an input argument with type matching the associated value in order to determine the response type.

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Samples

Find the bottom 5 values from i * 13 % 10007 for i = 1 to 10000, and the integer result of the operation that generated that modulus. 
SELECT into_values(
    min_n_by(sub.mod, sub.div, 5),
    NULL::INT)
FROM (
  SELECT (i * 13) % 10007 AS mod, (i * 13) / 10007 AS div
  FROM generate_series(1,10000) as i
) sub;
Output: 
into_values
-------------
(1,9)
(2,5)
(3,1)
(4,10)
(5,6)

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Arguments

NameTypeDefaultRequiredDescription
aggMinNBy-✔The aggregate to return the results from. Note that the exact type here varies based on the type of data stored.
dummyANYELEMENT-✔This is purely to inform Postgres of the response type. A NULL cast to the appropriate type is typical.

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Returns

The smallest values and associated data seen while creating this aggregate.