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我的 Oracle 数据库中有两个表。

第一张桌子是(客户)-

customer_id Customer_name Customer_age Customer_address salary
103 Giriraj Rathi      22   Kolkata    12000
100 Subir Adhikari     22   Bolpur     10000
101 Rakesh Chatterjee  21   Tarkeshwar 8000
102 Jayanta Patra      20   Tarkeshwar 9000
104 Abhi Karmakar      22   Burdwan    8000
105 Mainak Manna       21   Burdwan    9000
106 Subho Gupta        20   Kolkata    10000
107 Aritra Das         23   Kolkata    7000
108 Pradip Paul        22   Kolkata    5000
109 Sourav Banerjee    22   Bolpur     9000

第二张表是(订单):

Order_id Order_date   customer_id  amount

200 12-03-13    100 1100
201 09-05-13    101 1400
202 07-04-12    103 2500
204 29-05-13    104 2400
203 09-02-13    105 9000
205 18-06-13    106 2100
206 09-07-13    107 1600
207 18-05-13    108 2900
209 18-04-13    109 2400

现在我想加入这两个表。所以我使用了查询:

select customer_id,
       customer_name,
       customer_address, 
       order_id,order_date, 
       amount 
  from customers, 
       orders 
 where customers.customer_id=orders.customer_id; 

我用谷歌搜索了这个错误,发现当 SQL 代码本身存在歧义时会发生这种情况,但在这种情况下,我什么也看不到。

4

1 回答 1

2

像这样将表名/别名添加到列中总是一个好主意

select c.customer_id,
       c.customer_name, 
       c.customer_address, 
       o.order_id,
       o.order_date,
       o.amount 
from customers c
inner join orders o on c.customer_id = o.customer_id

如果您不这样做,那么数据库不知道要采用哪一列,并且两个表都有一个名为customer_id.

于 2013-09-22T06:22:07.723 回答