基本SQL查询问题

我有以下疑问：

SELECT     
  Base.ReportDate, 
  Base.PropertyCode, 
  Base.FirstName, 
  Base.MiddleName, 
  Base.LastName, 
  Person.FirstName, 
  Person.MiddleName, 
  Person.LastName
FROM  LeaseT INNER JOIN
   Base ON LeaseT.LeaseID = Base.LeaseID INNER JOIN
   Person ON LeaseT.TenantID = Person.ID

工作正常，只是对于基表中的每个记录，“Person”表中可能有0到“N”个人，但我只想为每个“Base”记录返回1（哪一个不重要，但Person.ID最低的记录）是一个合理的选择。如果person表中有0行，我仍然需要返回该行，但“person”字段的值为空

我将如何构造SQL来实现这一点

谢谢

---

编辑：是的，表的结构可能不正确，但此时无法重新构造-请使用现有的内容。

使用左连接

SELECT     
  Base.ReportDate, 
  Base.PropertyCode, 
  Base.FirstName, 
  Base.MiddleName, 
  Base.LastName, 
  d.FirstName, ou

  d.MiddleName, 
  d.LastName
FROM  LeaseT INNER JOIN
   Base ON LeaseT.LeaseID = Base.LeaseID INNER JOIN
left outer join   
 (select min(personid) as ID from person group by personid) as d 
on 
 LeaseT.TenantID = d.ID 
left outer join 
 (select FirstName, 
  MiddleName, 
  LastName from person) d1
on
  LeaseT.TenantID = d1.ID 

---

以下内容可能对您有所帮助

SELECT     
  Base.ReportDate, 
  Base.PropertyCode, 
  Base.FirstName, 
  Base.MiddleName, 
  Base.LastName, 
  d.FirstName, ou

  d.MiddleName, 
  d.LastName
FROM  LeaseT INNER JOIN
   Base ON LeaseT.LeaseID = Base.LeaseID INNER JOIN
left outer join   
 (select min(personid) as ID from person group by personid) as d 
on 
 LeaseT.TenantID = d.ID 
left outer join 
 (select FirstName, 
  MiddleName, 
  LastName from person) d1
on
  LeaseT.TenantID = d1.ID 

这行吗

SELECT     
  Base.ReportDate, 
  Base.PropertyCode, 
  Base.FirstName, 
  Base.MiddleName, 
  Base.LastName, 
  Person.FirstName, 
  Person.MiddleName, 
  Person.LastName
FROM  Base
LEFT JOIN (
    SELECT LeaseID, MIN(TenantID) AS [TenantID]
    FROM LeaseT
    GROUP BY LeaseID) AS [LeaseT_SinglePerson] ON Base.LeaseID = [LeaseT_SinglePerson].LeaseID
LEFT JOIN Person ON [LeaseT_SinglePerson].TenantID = Person.ID

这行吗

SELECT     
  Base.ReportDate, 
  Base.PropertyCode, 
  Base.FirstName, 
  Base.MiddleName, 
  Base.LastName, 
  Person.FirstName, 
  Person.MiddleName, 
  Person.LastName
FROM  Base
LEFT JOIN (
    SELECT LeaseID, MIN(TenantID) AS [TenantID]
    FROM LeaseT
    GROUP BY LeaseID) AS [LeaseT_SinglePerson] ON Base.LeaseID = [LeaseT_SinglePerson].LeaseID
LEFT JOIN Person ON [LeaseT_SinglePerson].TenantID = Person.ID

---

什么数据库？这又是“组中的最大值”，除了你想要的最小值而不是最大值。你到底想做什么，只是从每个基数中随机返回一个人？按照您现在的方式，我认为无论您做什么，它都会返回每个人，因为person字段位于select.what数据库中？这又是“组中的最大值”，除了你想要的最小值而不是最大值。你到底想做什么，只是从每个基数中随机返回一个人？你现在的样子，我想无论你做什么，它都会返回每个人，因为person字段在select中。我想LeaseT应该是左连接的，因为它是Base和Personsorry之间的连接，但我不理解你，我想LeaseT应该是左连接的，因为它是Base和Personsorry之间的连接，但我是不明白