商店和职工之间存在1对1的聘任和1对1的负责联系。这两个实体之间的ER图如下所示：转换后的关系模式是：商店（商店号、商店名、地址、电话，店长工号）职工（职工号，职工名，联系电话，工资，所在商店号）这两个关系模式关于主键和外键描述正确的是（）。

其它知识 2023-05-30

A.商店关系的主键是商店号，没有外键；职工关系的主键是职工号，没有外键。

B.商店关系的主键是商店号，店长工号是外键；职工关系的主键是职工号，没有外键。

C.商店关系的主键是商店号，没有外键；职工关系的主键是职工号，所在商店号是外键。

D.商店关系的主键是商店号，店长工号是外键；职工关系的主键是职工号，所在商店号是外键。

参考答案：

Which FOCAC summit witnessed the adoption of the Beijing Declaration-

类别: 题库 | 2024-01-12

Which of the following are the member states of SCO？

类别: 题库 | 2024-01-12

What areas have big progresses been made in China-Kyrgyzstan connectivity？

类别: 题库 | 2024-01-12

The date of 4th World Internet Conference.

类别: 题库 | 2024-01-12

How many countries co-launched the Digital Economy International Cooperation Initiative with China？

类别: 题库 | 2024-01-12

What is the area of the Chuvashia-Sichuan agricultural park？

类别: 题库 | 2024-01-12

Which specialties of Sichuan was the exclusive commodity in the ancient Silk Road？

类别: 题库 | 2024-01-12

In 2016， the authorities of the Chuvash Republic and the representative of Sichuan Railway Investment Group Co.， signed the Agreement on “Chuvashia – Sichuan” Agricultural Park in Beijing.

类别: 题库 | 2024-01-12

In the past five years， the infrastructure construction is booming.Major progress has been made in Inter-regional and intercontinental（）.

类别: 题库 | 2024-01-12

Railway interconnection between China and the B&R countries performed very well.In 2017，（）saw the highest growth rate when railway serves as the transportation mode.

类别: 题库 | 2024-01-12

加载更多~