关于SQL写法问题
表
ID SL TIME
1 1 2013-4-1
2 2 2013-4-2
1 1 2013-4-4
2 1 2013-4-4
语句要求
查询2013-4-1至2013-4-5 的字段ID 为1和2 的字段SL之和 不能重复
[解决办法]
select sum(sl) from (
select distinct ID,sl from 表 where time between '2013-4-1' and '2013-4-5'
)a
[解决办法]
select SUM(s) from (
select max(sl) s from 表 where [time] Between '2013-04-01' And '2013-04-05'
group by id) a
[解决办法]
create table tab3
(
ID int,SL int,time date
)
insert into tab3
select 1,1,'2013-04-01' union all
select 2,2,'2013-04-02' union all
select 1,1,'2013-04-03' union all
select 2,1,'2013-04-04'
select ID,sum(SL) SL from (
select ID,SL
from tab3
) b group by ID
ID SL
----------- -----------
1 2
2 3
(2 行受影响)
select ID,sum(SL) SL from (
select ID,SL
from tab3 where [time] Between '2013-04-01' And '2013-04-05'
) b group by ID
select distinct ID,sum(SL) SL
from
(
select ID,SL
from tab3
where [time] Between '2013-04-01' And '2013-04-05'
) b
group by ID
