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 Query with Count and group by
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DaveBF
Yak Posting Veteran

87 Posts

Posted - 11/19/2013 :  11:41:49  Show Profile  Reply with Quote
I have a table of people:
Name, City, Sex
I want a table where each line is the city, and the number of Males and Females.

For example, this is what I tried, and I know it's wrong:


Select City, count(name) where Sex = 'M' as NumberM,
count(name) where Sex = 'F' as NumberF
Group by City


how do I do this?
Thanks.

TG
Flowing Fount of Yak Knowledge

USA
6062 Posts

Posted - 11/19/2013 :  12:03:33  Show Profile  Reply with Quote
Here's one way:

Select City
       ,sum(case when sex = 'm' then 1 else 0 end) as NumberM
       ,sum(case when sex = 'f' then 1 else 0 end) as NumberF
Group by City


Be One with the Optimizer
TG
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DaveBF
Yak Posting Veteran

87 Posts

Posted - 11/19/2013 :  12:09:07  Show Profile  Reply with Quote
quote:
Originally posted by TG

Here's one way:

Select City
       ,sum(case when sex = 'm' then 1 else 0 end) as NumberM
       ,sum(case when sex = 'f' then 1 else 0 end) as NumberF
Group by City


Be One with the Optimizer
TG


Got it. Thanks!
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visakh16
Very Important crosS Applying yaK Herder

India
52317 Posts

Posted - 11/20/2013 :  02:02:23  Show Profile  Reply with Quote
Another way is to use pivot


select City,[m]  AS NumberM,[f] AS NumberF
from (select City,sex,1 as cnt
      from table
      )m
pivot (sum(cnt) for sex in ([m],[f]))p


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