Приветствую всех.
Подскажите как получить запись для каждого contragentid (учитывая последнюю дату) ? В моем случае для contragentid = 111270 по идее должна выводиться только запись на дату '14.05.2010'.
select dd.contragentid,
decode(dd.ratingvalue,'PK1',1,'PK2',2,'PK3',2,'PSR',2,'UN4',2,'VVL',2,'BK',4,3) as ratingvalue from
(select 36 as contragentid, 'UN1' as ratingvalue, '25.02.2010' as ratingstartdate from dual
union all
select 111270 as contragentid, 'PK1' as ratingvalue, '26.11.2009' as ratingstartdate from dual
union all
select 111270 as contragentid, 'PK3' as ratingvalue, '14.05.2010' as ratingstartdate from dual
union all
select 111270 as contragentid, 'BK' as ratingvalue, '14.06.2011' as ratingstartdate from dual ) dd
where dd.ratingstartdate <= to_date('31.05.2010', 'DD.MM.YYYY')
и контрагент
select * from
(select 5 as contragentid, 2 as ratingvalue from dual
union all
select 111270 as contragentid, 1 as ratingvalue from dual ) hh
