SQL Server query to roll up data - sql

Question

I have the following SQL statement. It joins three tables: Person, Deliverable, and DeliverableActions
select
p.first_name, p. last_name, d.title, da.type
from
Deliverable d
right join
Person p on d.person_responsible_id = p.id
right join
DeliverableAction da on da.DeliverableID = d.id
where
d.date_deadline >= #startDate and
d.date_deadline <= #endDate
order by
d.title
The result is the following:
first_name | last_name | title | type
-----------+-------------+--------------+------
Joe | Kewl | My_Report_1 | 2
Joe | Kewl | My_Report_1 | 3
Joe | Kewl | My_Report_1 | 1
Sly | Foxx | Other_Rep_1 | 1
Sly | Foxx | Other_Rep_1 | 2
My goal result is to get the following table:
first_name | last_name | title | type_1 | type_2 | type_3 | type_4
-----------+------------+--------------+--------+--------+--------+---------
Joe | Kewl | My_report_1 | 1 | 1 | 1 | 0
Sly | Foxx | Other_Rep_1 | 1 | 1 | 0 | 0
Unfortunately I don't know what term to describe what I'm doing. I've searched 'grouping' and 'aggregation', but I'm left without an answer so I am putting it to the community. Thank you in advance for your help.

Answer 1

you can use case based aggregation or you can also use pivot
select p.first_name,
p. last_name,
d.title,
sum(case when da.type = 1 then 1 else 0 end) as type_1,
sum(case when da.type = 2 then 1 else 0 end) as type_2,
sum(case when da.type = 3 then 1 else 0 end) as type_3,
sum(case when da.type = 4 then 1 else 0 end) as type_4,
from Deliverable d
right join Person p on d.person_responsible_id = p.id
right join DeliverableAction da on da.DeliverableID = d.id
where d.date_deadline >= #startDate and
d.date_deadline <= #endDate
group by p.first_name, p.last_name, d.title

Answer 2

select
first_name, last_name, title,
sum(case when type = 1 then 1 else 0 end) as type_1
from
(
select p.first_name, p. last_name, d.title, da.type from Deliverable d
right join Person p on d.person_responsible_id = p.id
right join DeliverableAction da on da.DeliverableID = d.id
where d.date_deadline >= #startDate and
d.date_deadline <= #endDate
) as a
group by first_name, last_name, title

Answer 3

You're looking for PIVOT
If you're using SQL Server 2008+, it has pivot function as described at http://technet.microsoft.com/en-us/library/ms177410%28v=sql.105%29.aspx
Basically, you write something like (sorry, I just pasted example from the quoted link but that should give you some idea):
-- Pivot table with one row and five columns
SELECT 'AverageCost' AS Cost_Sorted_By_Production_Days,
[0], [1], [2], [3], [4]
FROM
(SELECT DaysToManufacture, StandardCost
FROM Production.Product) AS SourceTable
PIVOT
(
AVG(StandardCost)
FOR DaysToManufacture IN ([0], [1], [2], [3], [4])
) AS PivotTable;