MySql學習（六）

使用子查詢sql 子查詢：即嵌套在其餘查詢中的查詢函數 select cust_name,cust_contact from customers where cust_id IN (select cust_id from orders where order_num IN (select order_num from orderitems where prod_id = 'TNT2')); 子查詢

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