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SQL Server 2005 GROUP BY and COUNT query for each month

This can be written much simpler by using a CASE expression inside of an aggregate function. This process is called PIVOT:

select book,
  sum(case when month(Date) = 1 then 1 else 0 end)
  sum(case when month(Date) = 2 then 1 else 0 end)
  sum(case when month(Date) = 3 then 1 else 0 end)
  sum(case when month(Date) = 4 then 1 else 0 end)
  sum(case when month(Date) = 5 then 1 else 0 end)
  sum(case when month(Date) = 6 then 1 else 0 end)
  sum(case when month(Date) = 7 then 1 else 0 end)
  sum(case when month(Date) = 8 then 1 else 0 end)
  sum(case when month(Date) = 9 then 1 else 0 end)
  sum(case when month(Date) = 10 then 1 else 0
end) Oct,
  sum(case when month(Date) = 11 then 1 else 0
end) Nov,
  sum(case when month(Date) = 12 then 1 else 0
end) Dec
from Rentals
where year(date) = 2011
group by book;

See SQL Fiddle with Demo. Instead of querying the table multiple times for each column, you use conditional aggregation to get the count for each book during the month and year.

Categories : SQL

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