Description of the illustration ''ratio_to_report.gif''

See Also:

"Analytic Functions" for information on syntax, semantics, and restrictions, including valid forms of`expr`

`RATIO_TO_REPORT`

is an analytic function. It computes the ratio of a value to the sum of a set of values. If `expr`

evaluates to null, then the ratio-to-report value also evaluates to null.

The set of values is determined by the `query_partition_clause`

. If you omit that clause, then the ratio-to-report is computed over all rows returned by the query.

You cannot nest analytic functions by using `RATIO_TO_REPORT`

or any other analytic function for `expr`

. However, you can use other built-in function expressions for `expr`

. Refer to "About SQL Expressions" for information on valid forms of `expr`

.

The following example calculates the ratio-to-report value of each purchasing clerk's salary to the total of all purchasing clerks' salaries:

SELECT last_name, salary, RATIO_TO_REPORT(salary) OVER () AS rr FROM employees WHERE job_id = 'PU_CLERK' ORDER BY last_name, salary, rr; LAST_NAME SALARY RR ------------------------- ---------- ---------- Baida 2900 .208633094 Colmenares 2500 .179856115 Himuro 2600 .18705036 Khoo 3100 .223021583 Tobias 2800 .201438849