在我们的示例中，普通 SQL 不足以实现仅选择部门 PR27 且仅返回员工姓名这项任务。
In our example, plain SQL is not sufficient to select only department PR27 and only return the employee names.
前者存储的信息涉及员工的姓名、地址和可享有的假期，而后者包含有关薪水和部门的信息。
The former stores information concerning the employee's name, address, and leave entitlement, while the latter contains information regarding salary and department.
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