"Analytic Functions" for information on syntax, semantics, and restrictions
PERCENT_RANK is similar to the
CUME_DIST (cumulative distribution) function. The range of values returned by
PERCENT_RANK is 0 to 1, inclusive. The first row in any set has a
PERCENT_RANK of 0. The return value is
Table 2-8 for more information on implicit conversion
As an aggregate function,
PERCENT_RANKcalculates, for a hypothetical row
ridentified by the arguments of the function and a corresponding sort specification, the rank of row
rminus 1 divided by the number of rows in the aggregate group. This calculation is made as if the hypothetical row
rwere inserted into the group of rows over which Oracle Database is to aggregate.
The arguments of the function identify a single hypothetical row within each aggregate group. Therefore, they must all evaluate to constant expressions within each aggregate group. The constant argument expressions and the expressions in the
BYclause of the aggregate match by position. Therefore the number of arguments must be the same and their types must be compatible.
As an analytic function, for a row
PERCENT_RANKcalculates the rank of
rminus 1, divided by 1 less than the number of rows being evaluated (the entire query result set or a partition).
Appendix C in Oracle Database Globalization Support Guide for the collation determination rules, which define the collation
PERCENT_RANK uses to compare character values for the
The following example calculates the percent rank of a hypothetical employee in the sample table
hr.employees with a salary of $15,500 and a commission of 5%:
SELECT PERCENT_RANK(15000, .05) WITHIN GROUP (ORDER BY salary, commission_pct) "Percent-Rank" FROM employees; Percent-Rank ------------ .971962617
The following example calculates, for each employee, the percent rank of the employee's salary within the department:
SELECT department_id, last_name, salary, PERCENT_RANK() OVER (PARTITION BY department_id ORDER BY salary DESC) AS pr FROM employees ORDER BY pr, salary, last_name; DEPARTMENT_ID LAST_NAME SALARY PR ------------- ------------------------- ---------- ---------- 10 Whalen 4400 0 40 Mavris 6500 0 Grant 7000 0 . . . 80 Vishney 10500 .181818182 80 Zlotkey 10500 .181818182 30 Khoo 3100 .2 . . . 50 Markle 2200 .954545455 50 Philtanker 2200 .954545455 50 Olson 2100 1 . . .