Find non existing time intervall when doing join to another table - sql

Question

I have a question that I dont know If there is solution to in sql. Made an small example
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Events](
[Id] [int] IDENTITY(1,1) NOT NULL,
[EventTime] [datetime] NOT NULL,
[Event] [nvarchar](50) NOT NULL
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[Logging] Script Date: 2020-07-07 14:35:17 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Logging](
[Id] [int] IDENTITY(1,1) NOT NULL,
[FromTime] [datetime] NOT NULL,
[ToTime] [datetime] NOT NULL,
[Status] [nvarchar](50) NULL
) ON [PRIMARY]
GO
SET IDENTITY_INSERT [dbo].[Events] ON
GO
INSERT [dbo].[Events] ([Id], [EventTime], [Event]) VALUES (1, CAST(N'2020-07-07T14:14:00.000' AS DateTime), N'str')
GO
INSERT [dbo].[Events] ([Id], [EventTime], [Event]) VALUES (2, CAST(N'2020-07-07T07:01:00.000' AS DateTime), N'testcall')
GO
INSERT [dbo].[Events] ([Id], [EventTime], [Event]) VALUES (3, CAST(N'2020-07-07T15:22:00.000' AS DateTime), N'ipfail')
GO
SET IDENTITY_INSERT [dbo].[Events] OFF
GO
SET IDENTITY_INSERT [dbo].[Logging] ON
GO
INSERT [dbo].[Logging] ([Id], [FromTime], [ToTime], [Status]) VALUES (1, CAST(N'2020-07-07T01:00:00.000' AS DateTime), CAST(N'2020-07-07T13:00:00.000' AS DateTime), N'All well')
GO
INSERT [dbo].[Logging] ([Id], [FromTime], [ToTime], [Status]) VALUES (2, CAST(N'2020-07-07T13:01:00.000' AS DateTime), CAST(N'2020-07-07T15:00:00.000' AS DateTime), N'All well')
GO
INSERT [dbo].[Logging] ([Id], [FromTime], [ToTime], [Status]) VALUES (3, CAST(N'2020-07-07T15:33:00.000' AS DateTime), CAST(N'2020-07-07T20:00:00.000' AS DateTime), N'All well')
GO
INSERT [dbo].[Logging] ([Id], [FromTime], [ToTime], [Status]) VALUES (4, CAST(N'2020-07-07T20:01:00.000' AS DateTime), CAST(N'2020-07-07T23:00:00.000' AS DateTime), N'All well')
GO
SET IDENTITY_INSERT [dbo].[Logging] OFF
GO
When doing an inner join of this table I want to find the Event in Event table that doesn't have a matching timeframe in Logging. The timeframe that's missing is 15:00 to 15:33 and the event that happens that happens is the Event with ID 3. Everything is measured in minutes. Is this possible? Or have to do it some other way?

Answer 1

If I understand correctly, you want not exists:
select l.*
from logging l
where not exists (select 1
from events e
where e.eventtime >= l.fromtime and
e.eventtime <= l.totime
);
However, this returns two timeframes -- ones with ids 3 and 4.
Here is a db<>fiddle.