SQL两个表并创建一个链接表 [英] SQL two tables and creating a link table

问题描述

我有两个表:Employee (ID, Name, Address) 和 Store(ID,Address)，我想记录每个商店工作人员的信息.

I have two tables: Employee (ID, Name, Address) and Store(ID,Address) and I would like to record information about people who work in each store.

我想创建一个名为 Employee_List 表的新表.我的问题:

I thought of making a new table called Employee_List table. My questions:

1- Employee_List 和 Employee 是一对多的关系吧?

1- Employee_List and Employee has one-to-many relation, right?

2- 要存储的 Employee_list 是一对一的关系，对吗?

2- Employee_list to store has one-to-one relation, right?

3- 如何为 Employee_List 表定义外键和主键?

3- How to define foreign and primary keys for Employee_List table?

推荐答案

Employee_list 应该有:

Employee_list should have:

• employee_listid (INT PK)
• employee_id (INT FK)
• store_id (INT FK)

我建议更改表名以表示复合表，即员工商店.这将使您的架构具有可扩展性，员工可以在多个商店工作.

I would recommend changing the table name to represent the composite table, i.e. EmployeeStores. This would allow your schema to be scalable, employees can work in multiple stores.

在SQL Server中:

CREATE TABLE EmployeeStores
(
   EMPLOYEEStoreID   INT IDENTITY,
   EMPLOYEEID INT FOREIGN KEY REFERENCES Employee(employee_id),
   STOREID INT FOREIGN KEY REFERENCES Store(store_id)
)

这篇关于SQL两个表并创建一个链接表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！