把问题简化了说
--入库数（一个sql从入库表中按天分组汇总统计出来的）
日期 当天入库
2012-02-20 1000
2012-02-22 1500
--出库数据（一个sql从出库表中按天分组统计出来的）
日期 当天出库
2012-02-20 500
2012-02-21 300
2012-02-22 500
2012-02-24 400
--求下面的结果
日期 入库/出库类型 数量 库存
2012-02-20 入库 1000 500
2012-02-20 出库 500 500
2012-02-21 出库 300 200
2012-02-22 入库 1500 1200
2012-02-22 出库 500 1200
2012-02-24 出库 400 800
------解决方案--------------------
- SQL code
USE TEMPDBGOIF OBJECT_ID('TB_IN') IS NOT NULL DROP TABLE TB_INIF OBJECT_ID('TB_OUT') IS NOT NULL DROP TABLE TB_OUTGOCREATE TABLE TB_IN(IN_DATE DATETIME,TOTAL INT)CREATE TABLE TB_OUT(OUT_DATE DATETIME,TOTAL INT)INSERT INTO TB_IN SELECT '2012-02-20', 1000 UNION ALLSELECT '2012-02-22', 1500INSERT INTO TB_OUTSELECT '2012-02-20', 500 UNION ALLSELECT '2012-02-21', 300 UNION ALLSELECT '2012-02-22', 500 UNION ALLSELECT '2012-02-24', 400GO;WITH MU AS (SELECT *,ROW_NUMBER() OVER(ORDER BY CHANGE_DATE,CASE WHEN TYPE='入库' THEN 1 ELSE 2 END) AS ROW FROM (SELECT IN_DATE AS CHANGE_DATE,TOTAL,'入库' AS TYPE FROM TB_INUNION ALLSELECT OUT_DATE,0-TOTAL,'出库' AS TYPE FROM TB_OUT) T),MU2 AS (SELECT *,TOTAL AS [库存] FROM MU WHERE ROW=1UNION ALLSELECT T1.*,T2.[库存]+T1.TOTALFROM MU T1INNER JOIN MU2 T2 ON T1.ROW=T2.ROW+1)SELECT CHANGE_DATE AS [日期],TYPE AS [类型], ABS(TOTAL) AS [变更数量],[库存]FROM MU2/*日期 类型 变更数量 库存2012-02-20 00:00:00.000 入库 1000 10002012-02-20 00:00:00.000 出库 500 5002012-02-21 00:00:00.000 出库 300 2002012-02-22 00:00:00.000 入库 1500 17002012-02-22 00:00:00.000 出库 500 12002012-02-24 00:00:00.000 出库 400 800*/
------解决方案--------------------
最好有一个递增ID,SQL2005以上版本可以用ROW_NUMBER()产生ID,下面是用临时表,好理解点
- SQL code
declare @t1 table (D datetime,Qty float)declare @t2 table (D datetime,Qty float)insert into @t1 select '2012-02-20', 1000 union allselect '2012-02-22', 1500insert into @t2select '2012-02-20', 500 union allselect '2012-02-21', 300 union allselect '2012-02-22', 500 union allselect '2012-02-24', 400select identity(int,1,1) as id,* into #t from(select D,Qty In_Qty,0 Out_Qty from @t1union allselect D,0,Qty from @t2) torder by D,In_Qty descselect D as '日期',case when In_Qty>0 then '入库' else '出库' end as '入库/出库类型',case when In_Qty>0 then In_qty else Out_Qty end as '数量',(select sum(In_Qty)-sum(Out_Qty) from #t where id<=t.id) as '库存'from #t as tdrop table #t/*日期 入库/出库类型 数量 库存----------------------- ------- ---------------------- ----------------------2012-02-20 00:00:00.000 入库 1000 10002012-02-20 00:00:00.000 出库 500 5002012-02-21 00:00:00.000 出库 300 2002012-02-22 00:00:00.000 入库 1500 17002012-02-22 00:00:00.000 出库 500 12002012-02-24 00:00:00.000 出库 400 800(6 行受影响)*/
------解决方案--------------------
再看了一下,原来LZ要按天来算???那变一下
- SQL code
select D as '日期',case when In_Qty>0 then '入库' else '出库' end as '入库/出库类型',case when In_Qty>0 then In_qty else Out_Qty end as '数量',(select sum(In_Qty)-sum(Out_Qty) from #t where id<=(select max(id) from #t where d=t.d)) as '库存'from #t as t/*日期 入库/出库类型 数量 库存----------------------- ------- ---------------------- ----------------------2012-02-20 00:00:00.000 入库 1000 5002012-02-20 00:00:00.000 出库 500 5002012-02-21 00:00:00.000 出库 300 2002012-02-22 00:00:00.000 入库 1500 12002012-02-22 00:00:00.000 出库 500 12002012-02-24 00:00:00.000 出库 400 800(6 行受影响)*/