How to use a Left Join with a bunch of other joins - sql-server

Question

I am trying to join two tables based on EquipWorkOrderID. Tables(EquipWorkOrder and EquipWorkOrderHrs)
With the query I have below it duplicates the row based on ID if there is two UserNm's for the Same ID. I want the two UserNm's and the Hrs if the ID match's in the same role if possible.
example of what my results give me now
EquipWorkOrderID/Equip/Description/Resolution/UserNm/Hrs
---------------------------------------------------------
1 / ForkLift / Bad /Fixed/John Doe / 2
1 /Forklift / Bad /Fixed/Jane Doe /2
What I would Like to see
EquipWorkOrderID/Equip/Description/Resolution/UserNm1/Hrs1/UserNm2/Hrs2
---------------------------------------------------------
1 / ForkLift / Bad /Fixed/John Doe / 2 / Jane Doe / 2
Select * From
(
Select
a.EquipWorkOrderID,
c.UserNm,
b.Hrs
From
EquipWorkOrder a
Left Join EquipWorkOrderHrs b
On a.EquipWorkOrderID = b.EquipWorkOrderID
Left Join AppUser c
On c.UserID = b.UserID
) t
Pivot (
Count(Hrs)
For UserNm IN (
[Tech1],
[Tech2],
[Tech3],
[Tech4],
[Tech5])
) AS pivot_table

Answer 1

I have placed the result of your query in a table (selection) and retrieved the data from it in a common table expression (cte). Replace the content of the CTE with your query and add the two new columns I created (UsrNum and HrsNum).
My solution uses a double pivot (one for the UserNm column and one for the Hrs column) followed by a grouping. This may not be ideal, but it gets the job done.
Here is a fiddle to show how I built up the solution.
Sample data
This just recreates the results of your current query.
create table selection
(
EquipWorkOrderID int,
Equip nvarchar(10),
Description nvarchar(10),
Resolution nvarchar(10),
UserNm nvarchar(10),
Hrs int
);
insert into selection (EquipWorkOrderID,Equip,Description,Resolution,UserNm,Hrs) values
(1, 'ForkLift', 'Bad', 'Fixed', 'John Doe', 2),
(1, 'Forklift', 'Bad', 'Fixed', 'Jane Doe', 2);
Solution
Replace the first part of the CTE with your query and add the two new columns.
with cte as
(
select EquipWorkOrderID,Equip,Description,Resolution,UserNm,Hrs,
'Usr' + convert(nvarchar(10),row_number() over(partition by Equip order by UserNm)) as 'UsrNum',
'Hrs' + convert(nvarchar(10),row_number() over(partition by Equip order by UserNm)) as 'HrsNum'
from selection
)
select ph.EquipWorkOrderId, ph.Equip, ph.Description, ph.Resolution,
max(ph.Usr1) as 'UserNm1',
max(ph.Hrs1) as 'Hrs1',
max(ph.Usr2) as 'UserNm2',
max(ph.Hrs2) as 'Hrs2'
from cte c
pivot (max(c.UserNm) for c.UsrNum in ([Usr1], [Usr2])) pu
pivot (max(pu.Hrs) for pu.HrsNum in ([Hrs1], [Hrs2])) ph
group by ph.EquipWorkOrderId, ph.Equip, ph.Description, ph.Resolution;
Result
Outcome looks like this. Jane Doe is UserNm1 because that is how the new UserNum column was constructed (order by UserNm). Adjust the order by if you need John Doe to remain first.
EquipWorkOrderId Equip Description Resolution UserNm1 Hrs1 UserNm2 Hrs2
----------------- --------- ------------ ----------- --------- ----- -------- -----
1 ForkLift Bad Fixed Jane Doe 2 John Doe 2
Edit: solution merged with original query (untested)
with cte as
(
SELECT TOP 1000
--Start original selection field list
ewo.EquipWorkOrderID,
ewo.DateTm,
equ.Equip,
equ.AccountCode,
equ.Descr,
ewo.Description,
ewo.Resolution,
sta.Status,
au.UserNm,
ewoh.Hrs,
cat.Category,
ml.MaintLoc,
equt.EquipType,
cre.Crew,
ewo.MeterReading,
typ.Type,
--Added two new fields
'Usr' + convert(nvarchar(10),row_number() over(partition by Equip order by UserNm)) as 'UsrNum',
'Hrs' + convert(nvarchar(10),row_number() over(partition by Equip order by UserNm)) as 'HrsNum'
FROM EquipWorkOrder ewo
JOIN EquipWorkOrderHrs ewoh
ON ewo.EquipWorkOrderID = ewoh.EquipWorkOrderID
JOIN AppUser au
ON au.UserID = ewoh.UserID
JOIN Category cat
ON cat.CategoryID = ewo.CategoryID
JOIN Crew cre
ON cre.CrewID = ewo.CrewID
JOIN Equipment equ
ON equ.EquipmentID = ewo.EquipmentID
JOIN Status sta
ON sta.StatusID = ewo.StatusID
JOIN PlantLoc pll
ON pll.PlantLocID = ewo.PlantLocID
JOIN MaintLocation ml
ON ml.MaintLocationID = ewo.MaintLocationID
JOIN EquipType equt
ON equt.EquipTypeID = ewo.EquipTypeID
JOIN Type typ
ON typ.TypeID = equ.TypeID
ORDER BY ewo.DateTm DESC
)
select ph.EquipWorkOrderId, ph.Equip, ph.Description, ph.Resolution,
max(ph.Usr1) as 'UserNm1',
max(ph.Hrs1) as 'Hrs1',
max(ph.Usr2) as 'UserNm2',
max(ph.Hrs2) as 'Hrs2'
from cte c
pivot (max(c.UserNm) for c.UsrNum in ([Usr1], [Usr2])) pu
pivot (max(pu.Hrs) for pu.HrsNum in ([Hrs1], [Hrs2])) ph
group by ph.EquipWorkOrderId, ph.Equip, ph.Description, ph.Resolution;
Edit2: how to use pivot...
Select pivot_table.*
From
(
Select a.EquipWorkOrderID,
b.Hrs,
c.UserNm,
'Tech' + convert(nvarchar(10), row_number() over(order by c.UserNm)) -- construct _generic_ names
From EquipWorkOrder a
Left Join EquipWorkOrderHrs b
On a.EquipWorkOrderID = b.EquipWorkOrderID
Left Join AppUser c
On c.UserID = b.UserID
) t
/*
Pivot (Count(Hrs) For UserNm IN ([Tech1], [Tech2], [Tech3], [Tech4], [Tech5])) AS pivot_table -- UserNm does not contain values like "Tech1" or "Tech2"
*/
Pivot (Count(Hrs) For GenUserNm IN ([Tech1], [Tech2], [Tech3], [Tech4], [Tech5])) AS pivot_table -- pivot over the _generic_ names