在 SQL Server 2008 中跨多个表使用 SQL 联接

Question

我有一个包含多个表的 SQL Server 2008 数据库，我需要加入这些表然后进行查询 该数据库有以下表格：

**Address** with unique reference column AddressNo
**Employee** with unique reference columns AddressNo & PersonNo
**EmploymentLink** with unique reference columns PersonNo & BusinessNo
**Business** with unique reference column  BusinessNo
**BusinessSICCode** with unique reference column BusinessNo

我想链接所有这些表，这样我就可以运行查询来拉回所有表中的数据，因为有多个表，我不知道该怎么做，希望得到任何帮助指导

以下是我目前提出的查询

SELECT Employee.*, Address.*,Business.*,BusinessSICCode.*
FROM Employee,Address,Business,BusinessSICCode 
JOIN Employee ON Employee.AddressNo = Address.AddressNo
JOIN Employee ON Employee.PersonNo = EmploymentLink.PersonNo 
JOIN Business ON Business.BusinessNo = EmploymentLink.BusinessNo 
JOIN BusinessSICCode ON BusinessSICCode.BusinessNo = Business.BusinessNo 

Answer 1

这样的事情应该会让你继续前进

SELECT * FROM
Address a INNER JOIN Employee e ON e.AdressNo = a.AddressNo
INNER JOIN EmploymentLine l on l.PersonNo = e.PersonNo
INNER JOIN Business b ON b.BusinessNo = l.BusinessNo
INNER JOIN BusinessSICCode c ON c.BusinessNo = b.BusinessNo

如果您有一些可能没有记录但仍需要父表中的值的表，您可以将 INNER JOINS 更改为 LEFT JOINS。