Help in Joining query

Question

Hi, How I can get desired result. I am joining two tables but if date timeline does't exist in #two table then should show hyphen (-). Please help on this query. Thanks.
create table #one (code_p char(4), code_h char(2), code_date datetime)
insert into #one values ('DEHG','2','2010-01-01')
insert into #one values ('DEHG','2','2011-01-01')
insert into #one values ('DEHC','2','2009-01-01')
insert into #one values ('DEHG','2','2012-01-01')
create table #two (code_p char(4), code_h char(2), code_date datetime)
insert into #two values ('DEHG','2','2010-01-01')
insert into #two values ('DEHC','2','2009-01-01')
select p.code_p code_p_one, p.code_h code_h_one, p.code_date code_date_one,
p.code_p code_p_two, p.code_h code_h_two, p.code_date code_date_two from #one p join #two a on p.code_p = a.code_p
--Result from the above query
code_p_one code_h_one code_date_one code_p_two code_h_two code_date_two
DEHG     2    2010-01-01     DEHG     2     2010-01-01
DEHG     2    2011-01-01     DEHG     2     2010-01-01
DEHC     2    2009-01-01     DEHG     2     2009-01-01
DEHC     2    2012-01-01     DEHG     2     2009-01-01
--Desired result
code_p_one code_h_one code_date_one code_p_two code_h_two code_date_two
DEHG     2    2010-01-01     DEHG     2     2010-01-01
DEHG     2    2011-01-01     DEHG     2     -
DEHC     2    2009-01-01     DEHG     2     2009-01-01
DEHC     2    2012-01-01     DEHG     2     -

Answer 1

Try this:
select p.code_p code_p_one, p.code_h code_h_one, p.code_date code_date_one,
p.code_p code_p_two, p.code_h code_h_two, ISNULL(CONVERT(varchar(50),a.code_date,121),'-') code_date_two
from #one p
left join #two a on p.code_p = a.code_p and p.code_date=a.code_date
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