you can achive by this two ways
If not Exists Method (Simple And Recomented way)
IF not exists (select * from otlike where id= "1452" and workdate = "2014-09-16")
BEGIN
insert into otlike values ("1452","g","g","df","dfg","fg","2014-09-16","dfg")
END
Using Tepm Variables
Declare @Count int
Set @Count = select count (*) from otlike where id= "1452" and workdate = "2014-09-16"
if( @Count = 0 )
insert into otlike values ("1452","g","g","df","dfg","fg","2014-09-16","dfg")
begin
end