Summing Results in a Table for Repeated Values - sql

Question

I'm currently in a tricky situation that I have been unable to figure out, and I was hoping you all might be able to help me solve my issue below:
I have a data set that includes a large amount of columns, however I am only going to show the columns pertinent to my issue (and I renamed them and put them in an excel doc).
What I am trying to do is develop a SQL query to calculate the total amount of PASS results and then the amount of FAIL Results for a given House Name. Each Result corresponds with a specific Resident ID and each Resident ID corresponds with a specific House Name/House ID. Unfortunately, the value Room ID needs to be in this data set, and each unique Room ID also corresponds with a specific House Name/House ID. Therefore, for every unique Room ID that exists for a given House Name, the Resident ID is being repeated.
For Example, if there are 7 Room IDs associated with a specific House Name/House ID, each unique Resident ID associated with that specific House Name/House ID will be repeated 7 times, once for every unique Room ID. Therefore, the Results are also all repeated 7 times. I have attached an example of what the data looks like below.
Note: Not all the data is included here. There are a few more rows to the AAAAAA data not shown, and there are a number of other House Names/House IDs.
Any thoughts would be much appreciated!

Answer 1

What you are looking for is GROUP BY.
Without looking at your data it is hard to come up with the exact query but i have created some test data.
create table House (HouseId int, HouseName nvarchar(max));
insert into House (HouseId, HouseName) values (1,'House A'), (2, 'House B'), (3,'House C');
create table Room (RoomId int, RoomName nvarchar(max), HouseId int);
insert into Room (RoomId, RoomName, HouseId)
values
(1,'Room 1 in house A', 1), (2,'Room 2 in house A', 1),
(3,'Room 3 in house B', 2),(4,'Room 4 in house B', 2),
(5,'Room 5 in house C', 3),(6,'Room 6 in house C', 3)
create table Resident (ResidentId int, ResidentName nvarchar(max), RoomId int, Result int);
insert into Resident (ResidentId, ResidentName, RoomId, Result)
values
-- House A = 4 passed, 0 failed
(1, 'Resident 1 in Room 1', 1, 82), (2, 'Resident 2 in Room 1', 1, 76),
(3, 'Resident 3 in Room 2', 2, 91), (4, 'Resident 4 in Room 2', 2, 67),
-- House B = 2 passed, 2 failed
(5, 'Resident 5 in Room 3', 3, 60), (6, 'Resident 6 in Room 3', 3, 64),
(7, 'Resident 7 in Room 4', 4, 28), (8, 'Resident 8 in Room 4', 4, 42),
-- House C = 3 passed, 1 failed
(9, 'Resident 9 in Room 5', 5, 99), (10, 'Resident 10 in Room 5', 5, 57),
(9, 'Resident 11 in Room 6', 6, 75), (10, 'Resident 12 in Room 6', 6, 38)
Then your query would look something like:
select
HouseName,
[Passed] = SUM(x.Passed),
[Failed] = SUM(x.Failed)
from
Resident re
outer apply (
--// Logic to determine if they passed or failed
--// I arbitrarily chose the number 50 to be the threshold
select [Passed] = case when re.Result >= 50 then 1 else 0 end,
[Failed] = case when re.Result < 50 then 1 else 0 end
) x
inner join Room r on r.RoomId = re.RoomId
inner join House h on h.HouseId = r.HouseId
group by
h.HouseName
here is a fiddle: http://sqlfiddle.com/#!18/30894/1