A pseudo-random number generator with a twist

Here is a (pseudo) random number generator function that has the added capability of limiting the range of numbers produced.

Here is a pseudo random number generator function that is simple to use and has the added capability of limiting the range of random numbers produced. There are times when you don't want just any random number from 1 thru 9999; for example, you may want all the random number to be four digit numbers. This function will produce random numbers of a specific length of digits. The basis of this function is the utilization of the DBMS_UTILITY...

package. More specifically the GET_HASH_VALUE and GET_TIME functions within this package. It requires two values: a string value to be used as the seed value and the number of digits the random number returned contains. It has been tested on Oracle 8.1.7.

CREATE OR REPLACE function Getrandomnumber (iseed IN
VARCHAR2, isize IN INTEGER)
return INTEGER IS
  irandomnbr INTEGER;
begin
SELECT
dbms_utility.get_hash_value(to_char(dbms_utility.get_time)||iseed,to_number(
'1'||substr('0000000000',1,isize-1)),to_number('9'||substr('0000000000',1,is
ize-1)))
INTO irandomnbr
FROM dual;
return irandomnbr;
end Getrandomnumber;
/

For More Information

  • Feedback: E-mail the editor with your thoughts about this tip.
  • More tips: Hundreds of free Oracle tips and scripts.
  • Tip contest: Have an Oracle tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize -- submit your tip today!
  • Ask the Experts: Our SQL, database design, Oracle, SQL Server, DB2, metadata, and data warehousing gurus are waiting to answer your toughest questions.
  • Forums: Ask your technical Oracle questions--or help out your peers by answering them--in our active forums.
  • Best Web Links: Oracle tips, tutorials, and scripts from around the Web.

This was first published in October 2002

Dig deeper on Oracle database design and architecture

Pro+

Features

Enjoy the benefits of Pro+ membership, learn more and join.

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

-ADS BY GOOGLE

SearchDataManagement

SearchBusinessAnalytics

SearchSAP

SearchSQLServer

TheServerSide

SearchDataCenter

SearchContentManagement

SearchFinancialApplications

Close