Oracle查询过去一个时间点的库存

create table CUX_ONHAND
(
  item_code       VARCHAR2(30),
  subinventory    VARCHAR2(30),
  transaction_qty NUMBER
);
create table CUX_TRANSACTION
(
  item_code        VARCHAR2(30),
  subinventory     VARCHAR2(30),
  transaction_date DATE,
  transaction_qty  NUMBER
);

1.计算2016年10月1日0点0分0秒现有量，数量为0的不显示，显示字段：物料、仓库、数量
2.计算不同仓库的现有量，显示字段：物料、仓库A数量、仓库B数量、其他仓库数量
1

SELECT tt.item_code,
       tt.subinventory,
       SUM(tt.transaction_qty) transaction_qty
  FROM (SELECT o.item_code, o.subinventory, o.transaction_qty
          FROM cux_onhand o
        UNION ALL
        SELECT t.item_code,
               t.subinventory,
               transaction_qty * (-1) transaction_qty
          FROM cux_transaction t
         WHERE t.transaction_date >=
               to_date('2016-10-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS')) tt
 GROUP BY tt.item_code, tt.subinventory
HAVING SUM(tt.transaction_qty) > 0

2

SELECT item_code,
       SUM(a.a_qty),
       SUM(a.b_qty),
       SUM(a.o_qty)
  FROM (SELECT t.item_code,
               decode(t.subinventory,
                      'A',
                      t.transaction_qty,
                      0) a_qty,
               decode(t.subinventory,
                      'B',
                      t.transaction_qty,
                      0) b_qty,
               decode(t.subinventory,
                      'A',
                      0,
                      'B',
                      0,
                      t.transaction_qty) o_qty
          FROM cux_onhand t) a
 GROUP BY a.item_code