一数据表格:
Carid(车辆id) jydate(加油日期) jysl(加油数量) jygls(加油公里数)
A 2012-06-02 30 1200
A 2012-06-12 35 1400
A 2012-06-22 32 1600
B 2012-06-02 34 1200
B 2012-06-24 33 1400
按照carid 加油月份 加油数量 加油公里数 平均油耗 显示:
其中平均油耗为(月份加油数合计-按日期该月第一次加油数量)×100/加油公里数之差
比如A车六月份油耗为(35+32)*100/(1600-1200),sql语句如何实现?
Carid(车辆id) jydate(加油日期) jysl(加油数量) jygls(加油公里数)
A 2012-06-02 30 1200
A 2012-06-12 35 1400
A 2012-06-22 32 1600
B 2012-06-02 34 1200
B 2012-06-24 33 1400
按照carid 加油月份 加油数量 加油公里数 平均油耗 显示:
其中平均油耗为(月份加油数合计-按日期该月第一次加油数量)×100/加油公里数之差
比如A车六月份油耗为(35+32)*100/(1600-1200),sql语句如何实现?
(
select carid, min(jydate) as minjydate, sum(jysl) as sumjysl, max(jygls) as maxjygls
from t
--where carid = 'A'
group by carid
)
select temp.carid, yh = (sumjysl - t.jysl) * 100 / (maxjygls - t.jygls)
from temp
inner join t on t.carid = temp.carid
and t.jydate = temp.minjydate注意jysl, jygls的定义,如果定义的是整数,那么最后的油耗也会是整数,需要手动转换。
;with
temp as
(
select carid, min(jydate) as minjydate, sum(jysl) as sumjysl, max(jygls) as maxjygls
from t
where carid = 'A'
group by carid
)
select cte.carid, yh = (sumjysl - t.jysl) * 100 / (maxjygls - t.jygls)
from cte inner join t on t.carid = cte.carid and t.jydate = cte.minjydate
IF OBJECT_ID('[tb]') IS NOT NULL DROP TABLE [tb]
GO
CREATE TABLE [tb]([Carid] VARCHAR(1),[jydate] DATETIME,[jysl] INT,[jygls] INT)
INSERT [tb]
SELECT 'A','2012-06-02',30,1200 UNION ALL
SELECT 'A','2012-06-12',35,1400 UNION ALL
SELECT 'A','2012-06-22',32,1600 UNION ALL
SELECT 'B','2012-06-02',34,1200 UNION ALL
SELECT 'B','2012-06-24',33,1400
GO--> 测试语句:
select a.Carid,convert(varchar(7),a.[min_jydate],120) as 月份,
(sum_jysl-b.jysl)*100.0/(end_jygls-begin_jygls) as 平均油耗
from
(
select Carid,min([jydate])as min_jydate,sum([jysl]) as sum_jysl
,min([jygls]) as begin_jygls
,max([jygls]) as end_jygls from tb
group by Carid,convert(varchar(7),[jydate],120)
) a
join tb as b on a.Carid=b.Carid and a.min_jydate=b.jydate
/*
Carid 月份 平均油耗
----- ------- ---------------------------------------
A 2012-06 16.750000000000
B 2012-06 16.500000000000(2 行受影响)
*/