Here's one way:
declare @t table (ID int, Keyword varchar(10))
insert @t
select 1, 'car' union all
select 1, 'boat' union all
select 1, 'van' union all
select 14, 'test' union all
select 14, 'car' union all
select 14, 'bike' union all
select 4, 'VAN' union all
select 5, 'scooter'
declare @id int
set @id = 1
select id
from @t
where keyword in
(
select keyword
from @t
where id = @id
)
and id <> @id
output:
id
-----------
14
4
Be One with the Optimizer
TG