Ecco il codice:
CREATE TABLE [ConferenceLog](
[ID] [int] IDENTITY(1,1) NOT NULL,
[AppInstanceID] [uniqueidentifier] NULL,
[SessionDuration] [int] NULL)
INSERT INTO [ConferenceLog]
([AppInstanceID],
[SessionDuration])
VALUES
('4B0EA86B-81E0-4BDE-A4A4-D4203B3317A0',150),
('4B0EA86B-81E0-4BDE-A4A4-D4203B3317A0',30),
('F9F44FD9-491D-4903-BF79-524444353329',10)
L'output desiderato sarebbe:
ID AppInstanceID Usage
--- ----------------------------------------------- ---------
1 F9F44FD9-491D-4903-BF79-524444353329 10
2 4B0EA86B-81E0-4BDE-A4A4-D4203B3317A0 180
....
Grazie