Quick Search:
CODE
Oracle PL/SQL Code Library
JOBS
Find Or Post Oracle Jobs
FORUM
Oracle Discussion & Chat
 Oracle PL/SQL: COVAR_POP Jump to:  
Category: >> Oracle PL/SQL >> COVAR_POP Bookmark and Share

<< lastnext >>

Snippet Name: COVAR_POP

Description: COVAR_POP returns the population covariance of a set of number pairs. Both expr1 and expr2 are numeric expressions. Virtuoso applies the function to the set of (expr1, expr2) pairs after eliminating all pairs for which either expr1 or expr2 is null. Then Virtuoso makes the following computation:

(SUM(expr1 * expr2) - SUM(expr2) * SUM(expr1) / n) / n

where n is the number of (expr1, expr2) pairs where neither expr1 nor expr2 is null.

Also see:
» BR2NL Function - Opposite of NL2BR
» A JavaScript implementation of the fam...
» Call a PHP function when clicking on a...
» FUNCTIONS: Deterministic
» FUNCTIONS: Nested Functions
» FUNCTIONS: IF statement
» FUNCTIONS: date/time
» FUNCTIONS: Sample functions
» FUNCTIONS: drop
» FUNCTIONS: Recompile
» FUNCTIONS: DEBUG mode
» FUNCTIONS: IN OUT parameter
» FUNCTIONS: with output parameters
» FUNCTIONS: with parameters
» FUNCTIONS: without parameters
» FUNCTIONS: Create function
» FUNCTIONS: special restrictions
» FUNCTIONS: System Privileges
» Recursive fopen() function
» INDEXES: ENABLE (function-based index)
» INDEXES: DISABLE (function-based index)
» PACKAGES: one function
» INDEXES: Function-Based Index
» IN Function
» Built-In Functions: CASE
» Built-In Functions: DECODE
» Alternate Title Case function
» SELECT: Using Functions
» RANK
» REGR_SLOPE

Comment: (none)

Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 06th, 2009

COVAR_POP(<expression1>, <expression2>) OVER (<analytic clause>)
 
conn oe/oe
 
SELECT project_id,
COVAR_POP(SYSDATE-hire_date, salary) AS COVAR_POP,
COVAR_SAMP(SYSDATE-hire_date, salary) AS COVAR_SAMP
FROM employee_list
WHERE department_id IN (50, 80)
GROUP BY project_id;


Free
Oracle Magazine
Subscriptions
and Oracle White Papers


SQL University.net courses meet the most demanding needs of the business world for advanced education in a cost-effective manner. SQL University.net courses are available immediately for IT professionals and can be taken without disruption of your workplace schedule or processes.

Compared to traditional travel-based training, SQL University.net saves time and valuable corporate resources, allowing companies to do more with less. That's our mission, and that's what we deliver.

Click here to find out more
 
Home      :      Code Library      :      Sponsors      :      Privacy      :      Terms of Use      :      Contact Us 43 users online    © 2009 psoug.org

PSOUG LOGIN
Username: 
Password: 
Forgot your password?