T-SQL Pivot table - sql-server

Question

I’ve a table MachineStatus which stores the status history of a machine.
The table looks like this:
| MachineStatusId | From | To | State | MachineId |
----------------------------------------------------------------------------------------------------------------------------------------
| B065FC43-DBE7-E611-9BDB-801F02F47041 | 2017-01-30 07:00:00 | 2017-01-30 08:00:00 | 1 | 92649C7B-E962-4EB1-B631-00086EECA98A |
| B165FC43-DBE7-E611-9BDB-801F02F47041 | 2017-01-30 08:00:00 | 2017-01-30 09:00:00 | 200 | 92649C7B-E962-4EB1-B631-00086EECA98A |
| B265FC43-DBE7-E611-9BDB-801F02F47041 | 2017-01-30 07:00:00 | 2017-01-30 08:00:00 | 1 | A2649C7B-E962-4EB1-B631-00086EECA98A |
| B365FC43-DBE7-E611-9BDB-801F02F47041 | 2017-01-30 08:00:00 | 2017-01-30 09:00:00 | 500 | A2649C7B-E962-4EB1-B631-00086EECA98A |
It stores for each machine, for each status change a record with the information [From] when [To] when a certain [State] was valid.
I like to calculate the time each machine spent in each state.
The result should look like this:
| MachineId | Alias | State1 | State200 | State500 |
-------------------------------------------------------------------------------------------------
| 92649C7B-E962-4EB1-B631-00086EECA98A | Somename | 60 | 60 | 0 |
| A2649C7B-E962-4EB1-B631-00086EECA98A | Some other name | 60 | 0 | 60 |
Each state should be represented as a column.
Here is wat I have tried so far:
SELECT
MAX(mState.MachineId),
MAX(m.Alias),
SUM(CASE mState.State WHEN 1 THEN mState.Diff ELSE 0 END) AS CritTime,
SUM(CASE mState.State WHEN 200 THEN mState.Diff ELSE 0 END) AS OpTime,
SUM(CASE mState.State WHEN 500 THEN mState.Diff ELSE 0 END) AS OtherTime
FROM
(
SELECT
DATEDIFF(MINUTE, ms.[From], ISNULL(ms.[To], GETDATE())) AS Diff,
ms.State AS State,
MachineId
FROM
MachineStatus ms
WHERE
ms.[From] >= #rangeFrom AND
(ms.[To] <= #rangeEnd OR ms.[To] IS NULL)
) as mState
INNER JOIN Machines m ON m.MachineId = mState.MachineId
GROUP BY
mState.MachineId,
m.Alias,
mState.State
Calculating the time and grouping the result by machines works but I cannot figure out how to reduce the result set only contain one row per machine but with a column per state.

Answer 1

I started in your subquery without apply any sum to your calculated data:
SELECT m.MachineId,
m.Alias,
Minutes,
s.State
FROM machines m
INNER JOIN states s ON m.MachineId = s.MachineId
Then you can pivot() for [State] and calculate the sum() of every state in this form:
WITH Calc AS
(
SELECT m.MachineId,
m.Alias,
Minutes,
s.State
FROM machines m
INNER JOIN states s ON m.MachineId = s.MachineId
)
SELECT MachineId, Alias, [State1], [State2], [State500]
FROM
(SELECT MachineId, Alias, State, Minutes FROM Calc) AS SourceTable
PIVOT
(
SUM(Minutes) FOR State IN ([State1],[State2],[State500])
) AS PivotTable;
This is the result:
+--------------------------------------+---------+--------+--------+----------+
| MachineId | Alias | State1 | State2 | State500 |
+--------------------------------------+---------+--------+--------+----------+
| 92649C7B-E962-4EB1-B631-00086EECA98A | Alias 1 | 100 | 100 | 100 |
+--------------------------------------+---------+--------+--------+----------+
| A2649C7B-E962-4EB1-B631-00086EECA98A | Alias 2 | 10 | 20 | 70 |
+--------------------------------------+---------+--------+--------+----------+
Notice that you must know how many states return your data.
Can check it here: http://rextester.com/DHDX77489