Oracle Database - SQL - Analytic Functions

Card Puncher Data Processing


Analytic functions in the Oracle Database Context


function() over (partition by mycolumns order by mycolumns)

An analytic function takes place after that the original data set is retrieved.

The clause

defines how the function is calculated (aggregated for an aggregate function). For a sum for instance, the following statement:
SUM(MyColumn) over (partition by Year)

will do a sum by year (partition = group by).

If the PARTITION BY clause is absent, then the function is computed over the whole query result set.


List of analytic functions

Analytics and Aggregate function

On the HR sample schema.

SELECT j.job_title, COUNT(*),
 MAX(salary) maxsalary,
 MIN(salary) minsalary,
 SUM(SUM(salary) over (), -- Grand Total Sum
 RANK() OVER(ORDER BY MAX(salary)) rankorder
FROM employees e, jobs j 
  e.job_id = j.job_id
 GROUP BY j.job_title
 ORDER BY rankorder;

Recommended Pages
Card Puncher Data Processing
Oracle Database - Analytics

The Oracle Advanced Analytics option of Oracle Database 11g Enterprise Edition includes: Oracle Data Mining and a new component called Oracle R Enterprise, which embeds R analytic capability in the...
Card Puncher Data Processing
Oracle Database - SQL - ROW_NUMBER function

ROW_NUMBER is an non-deterministic analytic function. The function assigns a sequential unique number: to each row to which it is applied (either each row in the partition or each row returned by the...
Data System Architecture
What are the LAG and LEAD SQL functions ?

lag and lead are Sql window functions that provide access to a row at a given offset prior to/after the current row position.

Share this page:
Follow us:
Task Runner