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Developer-C 11.1
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create table t1(folder_id int, code varchar(10),deleted_at date)
insert into t1 values (5333,'12VA1R','2018-05-02 12:37:00'), (5333, '12VA1', '2019-09-27 14:37:00'), (5683, '11SR1-X', '2019-02-04 15:40:00'), (5683, '12SR1-X', NULL)
select * from t1 a where coalesce(deleted_at,CURRENT_TIMESTAMP()) in (select max(coalesce(deleted_at,CURRENT_TIMESTAMP())) from t1 a1 where a.folder_id=a1.folder_id)
folder_id
code
deleted_at
5333
12VA1
2019-09-27
5683
12SR1-X
null