Sql 将数据从第三个表链接到第一个表和第二个表

我遇到了一个小问题，不知是否有解决办法。 试图找到存在的东西，但没有结果

这是我的代码：

Select
Order.AccountID,
Order.UserID,
Order.OrderID,
Order.OrderDate,
User.UserName,
Note.NoteID,
Note.UserID,
Note.NoteDate,
Note.Text

FROM
Order
INNER JOIN User ON (Order.UserID=User.UserID)
LEFT OUTER JOIN Note ON (Order.AccountID=Note.AccountID)

WHERE
Order.OrderDate >="2016-01-01"
AND
Order.OrderDate <= (current date -1 day)
AND
Note.NoteID IN (21,41,89)
AND
Note.NoteDate >="2016-01-01"
AND
Note.NoteDate<= (current date -1 day)

GROUPBY
Order.AccountID,
Order.UserID,
Order.OrderID,
Order.OrderDate,
User.UserName,
Note.UserID,
Note.NoteDate,
Note.Text

比如：

AccountID | OrderID | OrderDate | Order.UserID | Order.Username |  NoteID | NoteDate | Text | UserID | Note.Username

---

怎么办？

如果我正确理解了您的问题，您只需执行与使用别名相同的操作：

Select
  Order.AccountID,
  Order.UserID,
  Order.OrderID,
  Order.OrderDate,
  User.UserName,
  Note.NoteID,
  Note.UserID,
  Note.NoteDate,
  Note.Text,
  NoteWriter.UserName as 'NoteWriter_Username'

FROM
  INNER JOIN User ON (Order.UserID=User.UserID)
  LEFT OUTER JOIN Note ON (Order.AccountID=Note.AccountID)
  LEFT OUTER JOIN user NoteWriter on NoteWriter.userid = Note.userID

WHERE
  Order.OrderDate >="2016-01-01"
  AND Order.OrderDate <= (current date -1 day)
  AND Note.NoteID IN (21,41,89)
  AND Note.NoteDate >="2016-01-01"
  AND Note.NoteDate<= (current date -1 day)

选择
Order.AccountID，
Order.UserID，
Order.OrderID，
Order.OrderDate，
User.UserName，
Note.NoteID，
Note.UserID，
注：注：日期：，
注：案文，
NoteWriter.UserName作为“NoteWriter\u UserName”
从…起
上的内部联接用户（Order.UserID=User.UserID）
左侧外部联接注释打开（Order.AccountID=Note.AccountID）
NoteWriter.userid=Note.userid上的左外部加入用户NoteWriter
哪里
Order.OrderDate>=“2016-01-01”
和Order.OrderDate=“2016-01-01”
和Note.notedate您的问题是什么？您可以发布表定义吗？如果我不清楚，很抱歉XD问题：如何将用户名链接到我的笔记，因为它们已经链接到我的订单？表格：Order AccountID | OrderID | OrderDate | UserID User UserID | Username Note NoteID | NoteDate | Text | UserID您真的需要“分组”子句吗？像这样简单地更改Notes表上的连接是否可以满足您的需要？（User.UserID=Note.UserID）否，因为这会将下订单的用户链接到写便条的用户，我只想将我的便条链接到帐户。是的，别名，刚刚了解要点，谢谢！
Select
  Order.AccountID,
  Order.UserID,
  Order.OrderID,
  Order.OrderDate,
  User.UserName,
  Note.NoteID,
  Note.UserID,
  Note.NoteDate,
  Note.Text,
  NoteWriter.UserName as 'NoteWriter_Username'

FROM
  INNER JOIN User ON (Order.UserID=User.UserID)
  LEFT OUTER JOIN Note ON (Order.AccountID=Note.AccountID)
  LEFT OUTER JOIN user NoteWriter on NoteWriter.userid = Note.userID

WHERE
  Order.OrderDate >="2016-01-01"
  AND Order.OrderDate <= (current date -1 day)
  AND Note.NoteID IN (21,41,89)
  AND Note.NoteDate >="2016-01-01"
  AND Note.NoteDate<= (current date -1 day)