Topic: SQL*Plus and PL/SQL >> help me out ..
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| busi |
Posted: May 10, 2007 05:18:32 AM |
Total Post: 13
Joined: Jan, 2007
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hi
Any body can u give me some idea about partition clause ,exists ,over (),
over (partition by v)how to use these words in querys and when to use ...?
please give me some idea and examples if it's possible....
best regards
Busi
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 mujeeb |
| Posted: May 11, 2007 08:30:51 AM |  |
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Total Post: 5
Joined: May, 2007
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These type of queries are called Analytical queries,generally used for report generation purpose.
"Partition" is alternate to "group by" and more flexible.
example:
SELECT deptno "Deptno", ename "Ename", sal "Sal",
SUM(SAL)
OVER (PARTITION BY deptno
ORDER BY ename
ROWS 2 PRECEDING) "Sliding Total"
FROM emp
ORDER BY deptno, ename
The following link will be informative to you with good examples.
http://www.akadia.com/services/ora_analytic_functions.html#Top-N%20Queries
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