Left join does not return ull values - sql

Question

I have two tables:
AppWindowsEvent:
CREATE TABLE [AppWindowsEvent]
(
[idAppWindowEvent] INT IDENTITY(1,1)
, [idAppWindow] INT
, [idEventType] INT
, [Order] INT
, CONSTRAINT PK_idAppWindowEvent PRIMARY KEY ([idAppWindowEvent])
, CONSTRAINT FK_idAppWindowEvent_AppWindow FOREIGN KEY ([idAppWindow]) REFERENCES [AppWindow]([idAppWindow])
, CONSTRAINT FK_idAppWindowEvent_EventType FOREIGN KEY ([idEventType]) REFERENCES [EventType]([idEventType])
)
Event:
CREATE TABLE [Event]
(
[idEvent] [INT] IDENTITY(1,1) NOT NULL
, [idEventType] [INT] NOT NULL
, [idEntity] [INT] NOT NULL
, CONSTRAINT PK_IdEvent PRIMARY KEY([idEvent])
, CONSTRAINT [FK_Event_EventType] FOREIGN KEY([idEventType]) REFERENCES [EventType] ([idEventType])
)
When i run this query:
SELECT
*
FROM
AppWindowsEvent AWE
LEFT JOIN Event E ON AWE.idEventType = E.idEventType
WHERE
AWE.idMill = 1
AND AWE.idAppWindow = 1
ORDER BY
AWE.[Order] ASC
The result: not return nulls.
And when i run this
SELECT
*
FROM
AppWindowsEvent AWE
LEFT JOIN Event E ON AWE.idEventType = E.idEventType
AND E.[idEntity] = 1234
WHERE
AWE.idMill = 1
AND AWE.idAppWindow = 1
ORDER BY
AWE.[Order] ASC
Result: return nulls.
NOTE:
I need the entire set of data that are and are not already configured, in case you want a specific set of events, in the AND of ON can be filtered by specific idEntity of the Event table and the result returns well, but only for that idEntity, in my case I need all idEntity.

Answer 1

Try this
SELECT *
FROM
AppWindowsEvent AWE
LEFT JOIN Event E ON AWE.idEventType = E.idEventType
WHERE
AWE.idMill = 1
AND AWE.idAppWindow = 1
AND E.[idEntity] = 1234
ORDER BY
AWE.[Order] ASC
Or if you doesn't want appear null valor in second table, you can use Inner Join instead Left Join
SELECT *
FROM
AppWindowsEvent AWE
Inner JOIN Event E ON AWE.idEventType = E.idEventType
AND E.[idEntity] = 1234
WHERE
AWE.idMill = 1
AND AWE.idAppWindow = 1
ORDER BY
AWE.[Order] ASC