需求
数据如下：
想得到如下报表：
代码实现
create table test(usercode varchar, id int, oper_time date, duration int);
insert into test values('aaa', 1, date '2019-02-15', 12);
insert into test values('aaa', 2, date '2019-02-15', 8);
insert into test values('bbb', 3, date '2019-02-15', 0);
insert into test values('bbb', 4, date '2019-02-16', 15);
select * from test;
select oper_time, sum(case when usercode='aaa' then duration else 0 end) aaa ,sum(case when usercode='bbb' then duration else 0 end) bbb
from test
group by oper_time
order by oper_time;
