Sql 根据行日期从一个查询行中选择多行
我有一个问题。我想为查询中的每一行选择多行,如下所示:Sql 根据行日期从一个查询行中选择多行,sql,oracle,Sql,Oracle,我有一个问题。我想为查询中的每一行选择多行,如下所示: select process, fromdate, todate from ( select 'A' as process, to_date('03.04.2013','dd.mm.yyyy') as fromdate, to_date('06.04.2013','dd.mm.yyyy') as todate UNION select 'B' as process, to_date('06.04.2013','dd.mm.yyyy') as
select process, fromdate, todate from
(
select 'A' as process, to_date('03.04.2013','dd.mm.yyyy') as fromdate, to_date('06.04.2013','dd.mm.yyyy') as todate
UNION
select 'B' as process, to_date('06.04.2013','dd.mm.yyyy') as fromdate, to_date('10.04.2013','dd.mm.yyyy') as todate
)
Process Fromdate Todate
-----------------------------------------
A 03.04.2013 06.04.2013
B 06.04.2013 10.04.2013
Process Date
-----------------------
A 03.04.2013
A 04.04.2013
A 05.04.2013
B 06.04.2013
B 07.04.2013
B 09.04.2013
这表现为:
select process, fromdate, todate from
(
select 'A' as process, to_date('03.04.2013','dd.mm.yyyy') as fromdate, to_date('06.04.2013','dd.mm.yyyy') as todate
UNION
select 'B' as process, to_date('06.04.2013','dd.mm.yyyy') as fromdate, to_date('10.04.2013','dd.mm.yyyy') as todate
)
Process Fromdate Todate
-----------------------------------------
A 03.04.2013 06.04.2013
B 06.04.2013 10.04.2013
Process Date
-----------------------
A 03.04.2013
A 04.04.2013
A 05.04.2013
B 06.04.2013
B 07.04.2013
B 09.04.2013
但我需要这样的查询结果:
select process, fromdate, todate from
(
select 'A' as process, to_date('03.04.2013','dd.mm.yyyy') as fromdate, to_date('06.04.2013','dd.mm.yyyy') as todate
UNION
select 'B' as process, to_date('06.04.2013','dd.mm.yyyy') as fromdate, to_date('10.04.2013','dd.mm.yyyy') as todate
)
Process Fromdate Todate
-----------------------------------------
A 03.04.2013 06.04.2013
B 06.04.2013 10.04.2013
Process Date
-----------------------
A 03.04.2013
A 04.04.2013
A 05.04.2013
B 06.04.2013
B 07.04.2013
B 09.04.2013
我该怎么做
thaks…这真的帮助了我。谢谢
select process, from_date + n
from (
select process, fromdate, todate from
(
select 'A' as process, to_date('03.04.2013','dd.mm.yyyy') as fromdate, to_date('06.04.2013','dd.mm.yyyy') as todate
UNION
select 'B' as process, to_date('06.04.2013','dd.mm.yyyy') as fromdate, to_date('10.04.2013','dd.mm.yyyy') as todate
) s
join
(select level -1 as n from dual connect by level < 100) a
on (s.from_date+n < s.todate)