数据库计算差异
DECLARE @table TABLE
(
id INT,
date DATETIME,
sale FLOAT
)
INSERT INTO @table SELECT 1,'2012-12-01',0 UNION ALL
SELECT 2,'2012-12-02',10 UNION ALL
SELECT 3,'2012-12-03',0 UNION ALL
SELECT 4,'2012-12-04',100 UNION ALL
SELECT 5,'2012-12-05',0 UNION ALL
SELECT 6,'2012-12-06',1000
SELECT * FROM @table
WHERE DAY(date)%2=0
/*
想要双号的累加，计算差异
2号 就是金额10
4号 就是2号加4号的金额110
6号 就是2号加4号加6号的金额1110
*/
select id,date
,sale=(case when day(date)%2=1 then sale else (select sum(sale) from @table where day(date)%2=0 and date<=A.date) end )
from @table as A
