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Re: Creating Report for PieChart

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On Oct 13, 2015, at 19:56, Alex Magnum <magnum11200@xxxxxxxxx> wrote:

Hello,
I need to process some statistics for a pie chart (json) where I only want to show a max of 8 slices. If I have more data points like in below table I need to combine all to a slice called others. If there are less or equal 8 i use them as is.

I am currently doing this with a plperl function which works well but was just wondering out of curiosity if that could be done withing an sql query.

Anyone having done something similar who could point me in the right direction? 


SELECT count(*),country_name FROM stats_archive WHERE id=400 GROUP BY country_name ORDER BY COUNT DESC;
 count |   country_name
-------+-------------------
   302 | Malaysia
    65 | Singapore
    57 | Thailand
    26 | Indonesia
    15 | France
    14 | United States
    14 | India
    13 | Philippines
    12 | Vietnam
    10 | Republic of Korea
    10 | Canada
     7 | Australia
     6 | Brazil
     6 | Czech Republic
     5 | Switzerland
     4 | Saudi Arabia
     3 | Ireland
     3 | Japan
     3 | Sweden
     3 | South Africa
     3 | Belarus
     3 | Colombia
     3 | United Kingdom
     1 | Peru


   country_name  | count | perc  
-----------------+-------+-------
 Malaysia        |   302 |  51.4 
 Singapore       |    65 |  11.0 
 Thailand        |    57 |   9.7 
 Indonesia       |    26 |   4.4 
 France          |    15 |   2.6 
 United States   |    14 |   2.4 
 India           |    14 |   2.4 
 Others          |    95 |  16.1 
 Total           |   588 |   100 

Thanks a lot for any suggestions
I would use rank to get a rank number for each record. 


Alex

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