Pivot to display age span

Question

Hi!
I have a task to create a pivot table but i am not familiar on how this works.
My customer wants to have a pivottable that contains countries in a row and ages and gender in the columns.
The query would output something like this.
Country Male Female 0-1 1-2 2-3 3+
Bolivia    1     2         2      0   0     1
Kenya     2    0          0     1           1
I have a table with countries, that i join to another table with children, in the child table the date of birth field exists.
Perhaps this is better to do without a pivot and calculate and insert data to a temporary table and then output it using select.
Any hint on how to do this is greatly appreciated.
Regards
Martin

Answer 1

For your case I suggest CASE based pivot, e.g.
select C.Country,
count(case when B.Gender = 'Male' then 1 end) as Male,
count(case when B.Gender = 'Female' then 1 end) as Female,
count(case when datediff(day, B.DOB, CURRENT_TIMESTAMP) <=365 then 1 end) as [0-1],
count(case when datediff(day, B.DOB, CURRENT_TIMESTAMP) BETWEEN 366 AND 730 then 1 END) as [1-2], etc. 
FROM dbo.Countries C LEFT JOIN dbo.BioInfo B ON C.CountryID = B.CountryID
GROUP BY C.CountryID
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