结合两个查询 Oracle SQL

Question

我正在尝试结合我的两个单独工作的查询。 但我坚持试图让他们一起工作，并带来预期的结果。 这两个查询是：

select clientid, sum(fee) as "Total Spent"
from   bookings
group by clientid;

select l.clientid, sum(m.price * l.quantity) as "Total Spent"
from   lineitems l
       join merchandise m on m.merchid = l.merchid
group by l.clientid;

因此，最终目标是结合每个客户在预订和购买方面花费的金额。 即客户 ID 12 在预订上花费了 450 美元，在产品上花费了 85 美元； 所以总计为 535 美元。

数据集是这样的：

预订表：

+----------+-------+------------+----------+-----------+---------+------------+
| ClientId | Tour  | EventMonth | EventDay | EventYear | Payment | DateBooked |
+----------+-------+------------+----------+-----------+---------+------------+
|       12 | South | Feb        |       20 |      2016 |     225 | 19/02/2016 |
|       12 | West  | Mar        |        5 |      2016 |     225 | 3/03/2016  |
+----------+-------+------------+----------+-----------+---------+------------+

LineItems 表：

+----------+-------+------------+----------+-----------+---------+-----+
| ClientID | Tour  | EventMonth | EventDay | EventYear | MerchId | Qty |
+----------+-------+------------+----------+-----------+---------+-----+
|       12 | South | Feb        |       20 |      2016 |      20 |   1 |
+----------+-------+------------+----------+-----------+---------+-----+

商品表：

+---------+----------+------------+-------+
| MerchID | Category | ProdName   | Price | 
+---------+----------+------------+-------+
|      20 | A        | Highway    |    85 |    
+---------+----------+------------+-------+

任何帮助将不胜感激

Answer 1

您可以使用join ：

SELECT b.*, m.*, b.totalspent + c.totalspent
FROM (SELECT CLIENTID, SUM(FEE) AS TotalSpent
      FROM BOOKINGS2017
      GROUP BY CLIENTID
     ) b JOIN
     (SELECT L.CLIENTID, SUM(M.PRICE * L.QUANTITY) AS TotalSpent
      FROM LINEITEM2017 L JOIN
           MERCHANDISE2017 M
           ON L.MERCHID = M.MERCHID
      GROUP BY L.CLIENTID
    ) m
    USING (CLIENTID);

如果表具有不同的客户端集，您可能需要外连接。

Answer 2

这与 Gordon 的答案基本相同，但您的样本数据内联和总计：

-- Your sample data:
with bookings (clientid, tour, eventmonth, eventday, eventyear, payment, datebooked ) as
     ( select 12, 'South', 'Feb', 20, 2016, 225, date '2016-02-19' from dual union all
       select 12, 'West',  'Mar', 5,  2016, 225, date '2016-03-03' from dual union all
       select  2, 'West',  'Mar', 5,  2016, 225, date '2016-03-03' from dual union all
       select  2, 'West',  'Mar', 6,  2017, 225, date '2016-03-03' from dual union all
       select  2, 'West',  'Mar', 7,  2018, 225, date '2016-03-03' from dual )
   , lineitems (clientid, tour, eventmonth, eventday, eventyear, merchid, quantity) as
     ( select 12, 'South', 'Feb', 20, 2016, 20, 1 from dual )
   , merchandise (merchid, category, prodname, price) as
     ( select 20, 'A', 'Highway', 85 from dual )
--
-- Actual query starts here
--
select b.clientid
     , bookings_total
     , coalesce(merchandise_total,0) as merchandise_total
     , bookings_total + coalesce(merchandise_total,0) as grand_total
from   ( select clientid, sum(payment) as bookings_total
         from   bookings
         group by clientid ) b
       left join
        ( select l.clientid, sum(l.quantity * m.price) as merchandise_total
          from   lineitems l
                 join merchandise m on m.merchid = l.merchid
          group by clientid ) lm
        on  lm.clientid = b.clientid;


CLIENTID BOOKINGS_TOTAL MERCHANDISE_TOTAL GRAND_TOTAL
-------- -------------- ----------------- -----------
      12            450                85         535
       2            675                 0         675