SQLServer Invokes Trigger Even If There Is No Returned From Insert Subquery

Please try the following, see that trigger is getting invoked, even if there is no row inserted into trigger table.

drop TABLE X
GO
CREATE TABLE X (
x1 bigint NOT NULL ,
x2 nvarchar(40)
)
GO
drop TABLE Y
CREATE TABLE Y (
y1 bigint NOT NULL ,
y2 nvarchar(40)
)
GO
CREATE TRIGGER trg1
ON X
FOR INSERT AS
BEGIN
DECLARE
@prfirststatus INTEGER,
@newcontextid NCHAR
SELECT @newcontextid = x2,
@prfirststatus = x1
FROM inserted
PRINT 'See the trigger getting invoked without even a single ' +
' row being inserted in table X and values passed to this ' +
' triggers are inserted.x2 = ' + @newcontextid
insert into Y values (@prfirststatus,@newcontextid)
END
GO
insert into X SELECT y1, 'x' from Y where y2 = 'DOESNTEXIST'