说明: ORACLE 知识总结 思考题: 1、 ORACLE中存在哪几类子查询?描述各种子查询的区别? 2、 ORACLE是如何处理子查询中返回的空值? 实战练习题: 1、You need to create a report to display the names of customers with a credit limit greater than the average credit limit of all customers. Which SELECT statement should <zhangguo5> 上传 | 大小:61kb