以日历格式显示查询结果

Question

我有四个 tables 客户、产品、日历、订单，数据为 -

1) 客户 [CUST 是 PK]

CUST
----
ABC Inc
XYZ Corporation

2) 产品 [PID 是 PK]

PID     PRODUCT
---     -------
101     Chair
102     Table
103     Sofa
104     Cot

3) CALENDAR [DATE is PK] - 简单日历 table 用于存储日期和天数

DATE        DAY
----        ---
2015-01-01  THU
2015-01-02  FRI
....
2015-06-30  TUE

4) ORDERS [OID is PK] - 存储订单信息

OID     CUST     DATE        PID     QUANTITY
---     ----     ----        ---     --------
1       ABC Inc  2015-02-17  101     2
2       ABC Inc  2015-02-17  102     5
3       ABC Inc  2015-02-18  102     1
4       ABC Inc  2015-02-18  103     8
5       ABC Inc  2015-02-18  104     6

请帮助我使用 SQL/PLSQL 为 ABC Inc 客户获取订单详细信息，应该以日历格式（一周 5 个工作日）显示产品和数量，如-

PRODUCT     2015-02-16  2015-02-17  2015-02-18  2015-02-19  2015-02-20
-------     ----------  ----------  ----------  ----------  ----------
Chair       (null)      2           (null)      (null)      (null)
Table       (null)      5           1           (null)      (null)
Sofa        (null)      (null)      8           (null)      (null)
Cot         (null)      (null)      6           (null)      (null)

所有产品都应显示在第 1 列中。一周的开始和结束工作日期应该由sysdate决定。

Answer 1

你可以使用 PIVOT :

   WITH pvt AS (
           SELECT p.product, o.quantity, o.date
           FROM   Orders o
           JOIN Products p on o.pid=p.pid
           )
   SELECT *
   FROM   pvt
   PIVOT (
          quantity                    
          FOR date
          IN  ('2015-02-16','2015-02-17','2015-02-18', '2015-02-19','2015-02-20')   
         );

以日历格式显示查询结果

Display query results in calendar format

sql

oracle

calendar