This page is a quick reference checkpoint for PERCENT_RANK in IBM DB2: behavior, syntax rules, edge cases, and a minimal example; plus the official vendor documentation.
PERCENT_RANK returns a row's relative rank as a percentage between 0 and 1.
Returns the relative rank of the current row within its partition as a decimal between 0 and 1; first row receives 0; if the partition has only one row, the result is 0.
If this behavior feels unintuitive, the tutorial below explains the underlying pattern step-by-step.
Requires ORDER BY in the OLAP specification; computes (rank-1)/(rows_in_partition-1).
SELECT PERCENT_RANK() OVER (PARTITION BY dept ORDER BY salary) AS pct_rank FROM employees
If you came here to confirm syntax, you’re done. If you came here to get better at window functions, choose your next step.
PERCENT_RANK is part of a bigger window-function pattern. If you want the “why”, start here: Percentile Distribution
Reading docs is useful. Writing the query correctly under pressure is the skill.
For the authoritative spec, use the vendor docs. This page is the fast “sanity check”.
View IBM DB2 Documentation →Looking for more functions across all SQL dialects? Visit the full SQL Dialects & Window Functions Documentation.