Orders表代表订单信息含有订单号order_num和顾客id cust_id
| order_num | cust_id |
| a1 | cust10 |
| a2 | cust1 |
| a3 | cust2 |
| a4 | cust22 |
| a5 | cust221 |
| a7 | cust2217 |
Customers表代表顾客信息含有顾客id cust_id和 顾客名称 cust_name
| cust_id | cust_name |
| cust10 | andy |
| cust1 | ben |
| cust2 | tony |
| cust22 | tom |
| cust221 | an |
| cust2217 | hex |
| cust40 | ace |
【问题】检索每个顾客的名称(Customers表中的 cust_name)和所有的订单号(Orders 表中的 orde

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