How to find Nth percentile with SQLite?
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13-09-2019 - |
Question
I'll like to find Nth percentile.
for example: table: htwt; columns: name, gender, height, weight
result:
| gender | 90% height | 90% weight |
| male | 190 | 90 |
| female | 180 | 80 |
Solution
sqlite is not strong in analytical processing but if your data is not very large, you can try to emulate percentile with ORDER BY
, LIMIT 1
and a calculated OFFSET
. Note that OFFSET
is zero-based so you need to adjust it by one.
SELECT
height AS 'male 90% height'
FROM table
WHERE gender='male'
ORDER BY height ASC
LIMIT 1
OFFSET (SELECT
COUNT(*)
FROM table
WHERE gender='male') * 9 / 10 - 1;
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