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PERCENTILE_CONT ​

Given an ordered set of values, this aggregate function returns the continuous percentile value, which is the value from the set that corresponds to the specified fraction. For example, percentile_cont(0.5) returns the median value. If necessary, the percentile value is interpolated in the set. See also MEDIAN() and PERCENTILE_DISC.

percentile_cont(fraction) WITHIN GROUP (ORDER BY sort_expression)

Specify a fraction between 0 and 1. The sort expression data type must be numeric.

For example:

premdb=# select max(avg_att), min(avg_att), 
percentile_cont(0.2) within group (order by avg_att) from team where avg_att>0;
  max   |  min   | percentile_cont 
--------+--------+-----------------
 75.286 | 11.189 |          24.635
(1 row)
premdb=# select max(avg_att), min(avg_att), 
percentile_cont(0.9) within group (order by avg_att) from team where avg_att>0;
  max   |  min   | percentile_cont 
--------+--------+-----------------
 75.286 | 11.189 |         54.6313
(1 row)