Right join multiple key where mutiple key is null, Sql Server

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create table t ([Date] varchar(10), [Purchase] varchar(16), [Line_Purchase] varchar(16)) ; 
insert into t ([Date], [Purchase], [Line_Purchase]) values 
    ('2017-04-29', '0000002','01'),
    ('2017-04-29', '0000002','02'),
    ('2017-04-29', '0000003','01'),
    ('2017-04-29', '0000003','02'),
    ('2017-04-29', '0000003','03'),
    ('2017-04-29', '0000004','01'),
    ('2017-04-29', '0000005','01'),
    ('2017-04-19', '0000001','01'),
    ('2017-04-19', '0000001','02'),
    ('2017-04-19', '0000001','03'),
    ('2017-04-19', '0000002','01'),
    ('2017-04-19', '0000002','02')
    
select date as Input_date, Purchase, Line_Purchase
into #temptable
from t
where date = '2017-04-19' --convert(date, getdate() - 10);
    
insert into #temptable (Input_date, Purchase, Line_Purchase)
select *
from t
where date = '2017-04-29'
  and not exists (
    select 1
    from t as i
    where i.purchase=t.purchase
      and i.line_purchase=t.line_purchase
      and i.date = '2017-04-19' --convert(date, getdate() - 10)
    );

select * 
from #temptable;

View schema
Execution time: 0,03 sec, rows selected: 10, rows affected: 17, absolute service time: 0,17 sec