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Finding Usage Overlap

Posted on 2014-04-10
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Last Modified: 2014-04-10
Hello EE,

I have a set of usage data that I need to group by unique usage.  For example in my data, I need to know how many customer are contacting the help desk by using phone and mail format. In my data I can have customer who are using both mail and phone, phone only or mail only.  In the attached example, I need to group my data like below

Mail_Only        Phone_Only      Phone_Mail
     21                    2                      3

The data is in the data tab

Thanks in advance for your help
testdata.xlsx
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Question by:fb1990
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2 Comments
 
LVL 35

Accepted Solution

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johnsone earned 500 total points
ID: 39993184
This query gave me the results you were looking for.

SELECT SUM(CASE 
             WHEN phone_cnt = 0 
                  AND mail_cnt > 0 THEN 1 
             ELSE 0 
           END) mail_only, 
       SUM(CASE 
             WHEN phone_cnt > 0 
                  AND mail_cnt = 0 THEN 1 
             ELSE 0 
           END) phone_only, 
       SUM(CASE 
             WHEN phone_cnt > 0 
                  AND mail_cnt > 0 THEN 1 
             ELSE 0 
           END) phone_mail 
FROM   (SELECT pool_id, 
               SUM(CASE device 
                     WHEN 'Phone' THEN 1 
                     ELSE 0 
                   END) phone_cnt, 
               SUM(CASE device 
                     WHEN 'Mail' THEN 1 
                     ELSE 0 
                   END) mail_cnt 
        FROM   tbl1 
        GROUP  BY pool_id) cnt_data; 

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Author Closing Comment

by:fb1990
ID: 39993349
Sweet!  Thank you so much!
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