Question

I’m trying create a query that will output a total number, as well as a subset of the total number in SQL-Server. I can think of a way to do this via subqueries, but that seems like a ton of work. Is there a faster way to write this query?

Table name: orders


OrderID    Date           Type           OrderSize
1          1/1/2012       Electronics    $282.02
2          1/1/2012       Electronics    $1,000.56
3          1/1/2012       Books          $17.25
4          1/1/2012       Books          $10.00

What I am trying to output would look like this:

Date       ElectronicOrders    ElectronicOrderSize    BookOrders   BookOrderSize
1/1/2012   2                   $1,282.58              2            $27.25

I could create a temp table, then run 2 update queries – 1 WHERE Type = 'Electronics' and 1 WHERE Type = 'Books'.

What I have seen in some programming languages, such as R, is the ability to subset a variable. Is there a way for me to say something like:

count(OrderID, Type = 'Electronics) as ElectronicOrders, sum(OrderSize, Type = 'Electronics') as ElectronicOrderSize

Or am I stuck with subqueries and UPDATE queries?

Answer 1

I haven’t ever gotten the new PIVOT syntax to make sense in my head but you can do a pivot table by grouping, and taking aggregate functions in a case statement.

select [date], sum( case when type = 'Electronics' then (ordersize) else 0 end) AS ElectronicsSum,
sum( case when type = 'Electronics' then 1 else 0 end) AS ElectronicsCount,
sum( case when type = 'Books' then (ordersize) else 0 end) AS BooksSum,
sum( case when type = 'Books' then 1 else 0 end) AS BooksCoumt
from orders
group by [date]

I put a fiddle thing up to test it out. If Aaron B. posts up a solution, give him the answer credit, I might not have even recognized the pivotyness of it.