RE: Random Select of X % of total records
- From: Kevin Lange <klange@xxxxxxxxxx>
- To: oracle-l <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 7 Oct 2005 15:20:31 -0500
Thank you all.
OK. Which version did they put sample in .
Whatever happened to the good old days of Oracle 6.
-----Original Message-----
From: Justin Cave (DDBC) [mailto:jcave@xxxxxxxxxxx]
Sent: Friday, October 07, 2005 3:12 PM
To: klange@xxxxxxxxxx; oracle-l
Subject: RE: Random Select of X % of total records
Assuming the desire is to see roughly 10% of the CLAIMS table and you don't
have a particularly strict definition of "random", you should be able to
just use the SAMPLE clause
SCOTT @ hp92 Local> create table t as select * from all_objects;
Table created.
Elapsed: 00:00:04.23
SCOTT @ hp92 Local> select count(*) from t;
COUNT(*)
----------
29907
Elapsed: 00:00:00.54
SCOTT @ hp92 Local> select count(*) from t sample(10);
COUNT(*)
----------
2989
Elapsed: 00:00:00.08
Justin Cave <jcave@xxxxxxxxxxx>
Distributed Database Consulting, Inc.
http://www.ddbcinc.com
_____
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Kevin Lange
Sent: Friday, October 07, 2005 4:07 PM
To: oracle-l
Subject: Random Select of X % of total records
Evening all;
One of our developers is asking if there is a simple SQL way to generate a
random select of the total records in a table. i.e. They want to see 10%
of the records in the CLAIMS table.
Database in question is 9i (9.2.0.6)
SQL has to be simple because its going to be used by Cognos which does not
allow anonymous sql blocks.
I was hoping that some of the new analytical functions would work for this
but I have not used them yet.
Any help out there ??
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