Using postgres percentile function with negative numbers - ruby-on-rails

Question

I have a table of containing records with negative numbers:
ID
Location
Temperature
1
Paris
-1
2
London
-2
3
Berlin
-3
4
Moscow
-4
5
Rome
-5
6
Warsaw
-6
7
Madrid
-7
8
Amsterdam
-8
9
Milan
-9
10
Zurich
-10
(my actual records and values are more numerous and more complex, but this should help illustrate the issue)
I want to get the minimum, first quartile, median, third quartile, maximum of the temperature values, but in reverse.
For instance, in my example I would have:
Aggregate
Value
Minimum
-1
First quartile
-2.5
Median
-5
Third quartile
-7.5
Maximum
-10
The problem as I see it is that my numbers are negative. So when I run:
SELECT PERCENTILE_CONT(0.25) WITHIN GROUP (ORDER BY "city_temperatures"."temperature") AS percentile_temperature FROM "city_temperatures"
I actually get the value third quartile as opposed to the first quartile.
What's the best way to handle negative numbers in a query like this?

Answer 1

Add DESC to ORDER BY?
SELECT percentile_cont(0.25) WITHIN GROUP (ORDER BY t.temperature DESC) AS pct_temp
FROM city_temperatures t;
You might get all of it as array in a single calls with:
SELECT percentile_cont('{0,0.25,0.5,0.75,1}'::float8[])
WITHIN GROUP (ORDER BY t.temperature DESC) AS pct_temps
FROM city_temperatures t;