PERCENT_RANK
CUME_DIST
NTILE
累積分布値を返します。
CUME_DIST() OVER (w)
下記の値を入力するとサンプルに即時反映されます。
employee_id
salary
employees
SELECT employee_id, salary, ROUND(CUME_DIST() OVER (ORDER BY salary)::numeric, 4) AS cume_dist FROM employees;