RE: query for top 10 sql?
- From: Mark Richard <mrichard@xxxxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 11 Mar 2004 13:07:16 +1100
Originally I thought the same but then noticed it was "query for" & "top
ten sql" - which I interpreted as a query about SQL (similar to the
Statspack type results).
As far as the SQL Server "TOP" equivalent - I have not seen such a graceful
solution in Oracle. One approach I have seen includes using an ORDER BY in
a subquery and applying "where rownum <= 10" in the outer query - if the
inner query returns a large result set then a big sort is required. A
second approach might be to use an analytical function like RANK() or
ROW_NUM() - but again a large sort is often required. A third approach
relies on using index ordering (with a hint typically for force index
traversal) and "where rownum <= 10" applied on the original query - this
depends on a suitable index being available and is quite risky (for
example, if the index is dropped the query won't fail but will return a
very incorrect result without warning).
"Nelson Flores"
<nflores@xxxxxxxxx To:
<oracle-l@xxxxxxxxxxxxx>
> cc:
Sent by: Subject: RE: query for top 10
sql?
oracle-l-bounce@fr
eelists.org
11/03/2004 12:37
Please respond to
oracle-l
I think he means an SQL query where you get the first 10 rows...
Like the "Top" Command in SQL Server's T-SQL, or using DUAL in Oracle ..
From what I know, there is no ANSI standard for this.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Richard
Sent: Wednesday, March 10, 2004 5:28 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: query for top 10 sql?
Ryan,
"Top ten" what? I think that's why there are different queries out
there.
It all depends on what you care about and I doubt that any specific
query
is right or wrong - just a different view or definition of "top ten".
"Ryan"
<ryan.gaffuri@cox. To:
<oracle-l@xxxxxxxxxxxxx>
net> cc:
Sent by: Subject: query for top
10 sql?
oracle-l-bounce@fr
eelists.org
11/03/2004 11:04
Please respond to
oracle-l
is there a standard query for this? Seems like people have different
standards.
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