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SQL Anywhere 12.0.1 » SQL Anywhere Server - SQL Usage » Query and modify data » OLAP support » Window functions » Window ranking functions


CUME_DIST function

The cumulative distribution function, CUME_DIST, is sometimes defined as the inverse of percentile. CUME_DIST computes the normalized position of a specific value relative to the set of values in the window. The range of the function is between 0 and 1.

As the window moves down the input rows, the cumulative distribution is calculated for the expression specified in the window's ORDER BY clause. If the ORDER BY clause includes multiple expressions, the second and subsequent expressions are used to break ties if the first expression has the same value in adjacent rows. NULL values are sorted before any other value (in ascending sequence).

The following example returns a result set that provides a cumulative distribution of the salaries of employees who live in California.

SELECT DepartmentID, Surname, Salary,
      ORDER BY Salary DESC ) "Rank"
  FROM Employees 
  WHERE State IN ( 'CA' );

This query returns the following result:

DepartmentID Surname Salary Rank
200 Savarino 72300.00 0.333333333333333
200 Clark 45000.00 0.666666666666667
200 Overbey 39300.00 1
 See also