SQL Server - SUM and comma-separated values using GROUP BY clause - sql

Question

I have 2 tables:
NDEvent:
EventId EndTime
33 2020-10-23 15:00:00.000
33 2020-10-23 15:00:00.000
35 2020-10-21 03:30:00.000
35 2020-10-24 15:00:00.000
35 2020-10-25 15:00:00.000
34 2020-10-23 15:00:00.000
EventAppointment:
Id DocId EventId Amount
1 7647 34 10.00
2 7647 34 10.00
3 28531 33 20.00
4 7647 35 20.00
5 7647 35 100.00
6 7647 35 200.00
And I want result to be like this:
DocId EventId Amount Id
7647 34 20.00 1,2
28531 33 20.00 3
7647 35 320.00 4,5,6
What I have tried is:
select e.Amount,e.DoctorId,e.EventId,
Id= STUFF(
(SELECT DISTINCT ',' + CAST(e.Id as nvarchar(max))
from NDEvent nd
inner join EventAppointment e on nd.Id = e.EventId
where
GETDATE() > nd.EndTime
GROUP BY
e.Amount,e.DoctorId,e.EventId,e.Id
FOR XML PATH(''))
, 1, 1, ''
)
from NDEvent nd
inner join EventAppointment e on nd.Id = e.EventId
where
GETDATE() > nd.EndTime
GROUP BY
e.Amount,e.DoctorId,e.EventId
But it is not giving expected result.
Could anyone help with this query? Or point me to a right direction? Thank you.

Answer 1

It doesn't look like yo need to NDEvent table here at all (though I include it in the sample data). Just SUM and STRING_AGG against EventAppointment:
USE Sandbox
GO
WITH NDEvent AS(
SELECT *
FROM (VALUES(33,CONVERT(datetime,'2020-10-23T15:00:00.000')),
(33,CONVERT(datetime,'2020-10-23T15:00:00.000')),
(35,CONVERT(datetime,'2020-10-21T03:30:00.000')),
(35,CONVERT(datetime,'2020-10-24T15:00:00.000')),
(35,CONVERT(datetime,'2020-10-25T15:00:00.000')),
(34,CONVERT(datetime,'2020-10-23T15:00:00.000')))V(EventID,EndTime)),
EventAppointment AS(
SELECT *
FROM (VALUES(1,7647 ,34,10.00),
(2,7647 ,34,10.00),
(3,28531,33,20.00),
(4,7647 ,35,20.00),
(5,7647 ,35,100.00),
(6,7647 ,35,200.00))V(Id,DocId, EventID, Amount))
SELECT DocID,
EventID,
SUM(Amount) AS Amount,
STRING_AGG(Id,',') WITHIN GROUP (ORDER BY Id) AS IDs
FROM EventAppointment EA
GROUP BY DocId,
EventID;

Answer 2

Can be used in other data.
WITH Table1 AS(
SELECT EventId FROM NDEvent
GROUP BY EventId
),
Table2 AS(
SELECT e.DocId,e.EventId,e.Amount,
STUFF((
SELECT ',' + CAST(ee.Id as nvarchar)
FROM EventAppointment ee
where ee.EventId = e.EventId
GROUP BY ee.EventId,ee.Id
FOR XML PATH('')), 1, 1, '') AS Id
FROM Table1 t
LEFT OUTER JOIN EventAppointment e ON t.EventId = e.EventId
)
SELECT DocId,EventId,SUM(Amount) AS Amount,Id FROM Table2
GROUP BY DocId,EventId,Id