我给定的任务股票项目的管理,其中股票可以是三种类型(1-供应商,2家公司,3对客户),SQL选择记录的最迟日期
我有2个表(A和B )来维护它,A用来跟踪当前状态,B用作历史表来跟踪移动
初始将股票类型1,所以插入A,如果公司购买它,表B将从表A插入对于该记录并且将更新表A中的存货类型,
以便获得期末库存余额直到我可以从表A读取的特定日期,
,但有困难得到期初存货余额这里,我从表B中读取
谁能帮助,对不起,如果表中的我的问题混淆
结构:
表A
NUM_REF CHAR (6) NOT NULL,
BRANCH CHAR (5) NOT NULL,
STOCK_TYPE CHAR (3) NOT NULL,
INSERT_DATE TIMESTAMP NOT NULL
表B
0123从表记录从表B A
000295 10400 03 10/24/2011 5:11:12 PM 10/11/2011 12:27:21 PM
000338 10400 02 10/14/2011 7:51:56 PM 10/13/2011 12:54:28 PM
000399 10400 03 10/24/2011 6:25:53 PM 10/21/2011 6:13:20 PM
000400 10400 02 10/14/2011 8:06:21 PM 10/14/2011 4:21:37 PM
000410 10400 03 10/18/2011 5:17:36 PM 10/18/2011 5:17:36 PM
000416 10400 03 10/18/2011 5:27:19 PM 10/18/2011 5:27:19 PM
000420 10400 03 10/25/2011 6:18:35 PM 10/17/2011 3:01:49 PM
000423 10400 03 10/25/2011 6:18:35 PM 10/17/2011 4:10:00 PM
000450 10400 03 10/19/2011 4:45:38 PM 10/18/2011 2:30:40 PM
记录
000284 10400 01 10/10/2011 5:49:15 PM
000288 10400 01 10/11/2011 12:22:50 P
000289 10400 01 10/11/2011 12:23:35 P
000295 10400 01 10/11/2011 12:27:21 P
000295 10400 03 10/13/2011 2:47:33 PM
000295 10400 03 10/13/2011 2:58:31 PM
000295 10400 03 10/13/2011 3:22:19 PM
000295 10400 03 10/13/2011 4:34:07 PM
000295 10400 03 10/13/2011 4:41:08 PM
000295 10400 03 10/13/2011 4:41:40 PM
000295 10400 03 10/13/2011 4:45:05 PM
000295 10400 03 10/13/2011 4:46:36 PM
000295 10400 03 10/13/2011 4:56:03 PM
000295 10400 03 10/13/2011 4:58:47 PM
000295 10400 03 10/14/2011 11:15:47 A
000295 10400 03 10/14/2011 5:45:33 PM
000296 10400 01 10/11/2011 12:27:21 P
000328 10400 01 10/13/2011 12:20:49 P
000328 10400 03 10/14/2011 12:31:07 P
000328 10400 03 10/17/2011 3:41:45 PM
000328 10400 03 10/18/2011 12:14:21 P
000328 10400 02 10/20/2011 4:41:39 PM
000331 10400 01 10/13/2011 12:25:02 P
000331 10400 03 10/14/2011 3:03:31 PM
000331 10400 03 10/17/2011 3:54:02 PM
000333 10400 01 10/13/2011 12:33:19 P
000333 10400 03 10/14/2011 4:01:59 PM
000333 10400 03 10/18/2011 11:06:18 A
000337 10400 01 10/13/2011 12:52:23 P
000338 10400 01 10/13/2011 12:54:28 P
000369 10400 01 10/14/2011 12:33:43 P
000369 10400 02 10/14/2011 8:05:03 PM
000369 10400 03 10/17/2011 2:42:19 PM
000369 10400 03 10/18/2011 2:24:56 PM
000399 10400 01 10/21/2011 6:13:20 PM
000400 10400 01 10/14/2011 4:21:37 PM
000420 10400 01 10/17/2011 3:01:49 PM
000420 10400 03 10/17/2011 3:13:07 PM
000420 10400 03 10/25/2011 6:16:43 PM
000423 10400 01 10/17/2011 4:10:00 PM
000423 10400 03 10/25/2011 6:16:43 PM
000424 10400 01 10/17/2011 4:22:04 PM
000424 10400 03 10/25/2011 6:42:06 PM
000425 10400 01 10/17/2011 4:24:41 PM
000425 10400 03 10/25/2011 6:42:06 PM
@ user438159你应该向我们提供这两个表的结构。 –
你的问题有点令人困惑,也许如果你可以发布一些示例数据和你已有的任何代码? – Purplegoldfish