Top N and Bottom N

Hi, I have a question about using the top N and bottom N conditions in a query. If I set my condition to show the bottom 1, and there are multiple rows that have 0%, then how does the query determine which row to display as the bottom 1?
I ask this because I have such a query and result set as described above. The bottom 1 that is returned actually shows up in the middle of the list when I display all rows.
Any help is appreciated. Thanks.

Hi Audrey,
this is an excellent question. It took me a while to find the answer. The OLAP engine is using the standard ABAP SORT statement to rank the values.
TOP N:
SORT c_t_rank BY value DESCENDING.
BOTTOM N:
SORT c_t_rank BY value.
Now the SORT statement does not preserve the original order of the records. If values are identical, the outcome of the sort is not defined. Potenially it could be different every time you execute the query. The SORT statement also has an option to preserve the order of the records, but because this has a performance impact, it is not used by the OLAP engine.
Kind regards,
Marc
SAP NetWeaver RIG, US BI

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Hi all ,
Can anyone help me in solving the following problem ..
How to get top 5 and bottom 5 selling books in a single query
Eg:
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A 45
B 78
C 8
D 6
T 66
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Since, in general, more than one book can have same no_sold, more than 5 books can have top/bottom no_sold. If you want all 5 top and bottom selling books, use:
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from      t t1
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where t1.rnk_top <= 5
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AB AD          95              5          1
B D           78              6          2
T C           66              8          3
AC E           51             33          4
A AA          45             35          5
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select t1.book_name,
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SQL> SY.

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My problem is to find out top and bottom 5 selling books for a particular year.
For example,
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Top_5 Bottom_5
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Hi,
Welcome to the forum!
915235 wrote:
My source table contains
Book_id Quantity Selling_date
My problem is to find out top and bottom 5 selling books for a particular year.
For example,
For year 2010,
Top_5 Bottom_5
b1 b2
b6 b8
In this way I want to get output for watever year I want.Here's one way to get the results for a given year:
WITH     got_nums     AS
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     ,       TRUNC (selling_date, 'YEAR')     AS selling_year
     ,       RANK () OVER ( ORDER BY      SUM (quantity)     DESC
                      )     AS t_num
     ,       RANK () OVER ( ORDER BY      SUM (quantity)     ASC
                      )     AS b_num
     FROM       source_table
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SELECT       *
FROM       got_nums
WHERE       t_num     <= 5
OR       b_num     <= 5
,       t_num
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It looks liek there's another part to this problem, which is displaying the book_ids in 2 columns, rather than 1. That's called a Pivot , and how to do it depends on your version of Oracle, and also on how you want to deal with ties. See the forum FAQ {message:id=9360005}
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SQL> SELECT A.DNAME, B.ENAME, B.SAL FROM DEPT A, EMP B WHERE A.DEPTNO = B.DEPTNO ORDER BY DNAME, SAL
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Search for "top-N query" in oracle doucmentation.
Example :
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CA Forum: Crystal Reports
I have two groups, Group1 is by PartNum and Group2 is by WorkCenter. I also have 1 detail section. I want to only show/select the middle 60% of records, or to reword that I want to eliminate the top 20% and bottom 20% of the detail records. How do I do this? I have tried using the Nth Largest and Nth Smallest and even Pth Percentile functions but I just don't seem to know how to use them correctly since I need this done at the detail level and not group level.
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CA Forum: Crystal Reports
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Eliminate top and bottom 20% of detail records

Post Author: optikconnex
CA Forum: General
I have two groups, Group1 is by PartNum and Group2 is by WorkCenter. I also have 1 detail section. I want to only show/select the middle 60% of records, or to reword that I want to eliminate the top 20% and bottom 20% of the detail records. How do I do this? I have tried using the Nth Largest and Nth Smallest and even Pth Percentile functions but I just don't seem to know how to use them correctly since I need this done at the detail level and not group level.
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Post Author: kcheeb
CA Forum: Crystal Reports
You could try hiding the records based on your formula but I suspect that'll throw your group totals off.
You might be best off using SQL to do that for you. Most of the major databases have Datamart type functions you can use.

I plugged my macbook pro into an external monitor, then unplugged it later and now it is stuck with black borders on top and bottom and zoomed out like it is still on the monitor. How do I fix it?

I started using my external monitor with my macbook pro and as soon as I plug it in it to the monitor it adjusts the screen by zooming out a bit and creating about 3/4 of an inch black borders on the top and bottom of the screen. But these dont show up on the monitor so I assumed it was fine. But when I took it off the monitor, the borders were still there like it was still on the monitor. Any hellp? Its starting to mess with my eyes haha.

Hi aefulcher,
It sounds like you had the external display set to mirror the internal display so the resolution(s) were changed to match each other.
OS X: How to use multiple displays with your Mac in Mountain Lion and earlier
http://support.apple.com/kb/ht5019
Check if the current resolution matches your screen's natiive resolution.
Thank you for visiting Apple Support Communities.
Nubz

Top N and Bottom N

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