MySQL Query和JOINS

Question

我无法弄清楚如何使这个查询有效。

我有一张人员及其个人资料表。 我有一张让我们称之为

的表格

假设表中包含以下字段：

PEOPLE
id, code, name, lastname

HOUSES
id, codeowner, codeintermediate, codebuyer, area, numberofrooms

如果我有三个列与同一个表（人）的关系，我该如何进行LEFT JOIN工作？

如果业主，中间商和买家分开，我会使用像

这样的东西

"SELECT
houses.*,

owners.name AS ownersname,
intermediates.name AS intermediatesname,
buyers.lname AS buyersname
FROM houses
LEFT JOIN owners ON houses.codeowner = owners.code
LEFT JOIN intermediates ON houses.codeintermediate = intermediates.code
    LEFT JOIN buyers ON houses.codebuyer = buyers.code

但是如何使用单个PEOPLE表进行此操作呢？我该如何使用别名呢？先谢谢你了！

Answer 1

加入人员表3次

SELECT
houses.*,

owners.name AS ownersname,
intermediates.name AS intermediatesname,
buyers.name AS buyersname
FROM houses
LEFT JOIN people as owners ON houses.codeowner = owners.code
LEFT JOIN people as intermediates ON houses.codeintermediate = intermediates.code
LEFT JOIN people as buyers ON houses.codebuyer = buyers.code