Question

我正在尝试将数据插入到库存表中，从单独的Users表中提取UserID以填充其中一个字段。

 Inventory:
 ProductID | PurchasedByUser | OtherAttributes

和用户表;

 Users:
 DBID | UserActive | UserName
   1  |     1      |  mathew

到目前为止我的SQL看起来像：

 INSERT INTO Inventory (ProductID, PurchasedByUser, OtherAttributes)
 SELECT 23, U.DBID, 'Yellow'
 FROM Inventory U INNER JOIN Users ud 
 ON U.DBID = ud.DBID AND ud.UserActive = 1 AND UserName = 'mathew'

编辑：我希望能够添加一个SQL INSERT请求 ProductID（INT），PurchasedByUser（Users.DBID），OtherAttributes（String）到Inventory表，不暴露DBID并仅传递UserName字段。

Answer 1

在查询中U.DBID错误，因为U是广告资源的别名所以请更改并放置ud.DBID，您的查询将会得到解决。

INSERT INTO Inventory (ProductID, PurchasedByUser, OtherAttributes)
SELECT 23, ud.DBID, Yellow
FROM Inventory U INNER JOIN Users ud 
ON U.PurchasedByUser = ud.DBID AND ud.UserActive = 1 AND ud.UserName = 'mathew'

Answer 2

将U.DBID更改为ud.DBID

INSERT INTO Inventory (ProductID, PurchasedByUser, OtherAttributes)
SELECT 23, ud.DBID, 'Yellow'
FROM Inventory U INNER JOIN Users ud 
ON U.PurchasedByUser = ud.DBID AND ud.UserActive = 1 AND ud.UserName = 'mathew';

Answer 3

在您构建的SQL查询中，您指的是U的DBID，它是Inventory表。从您分享的结构中，我认为您需要以下查询：

 INSERT INTO Inventory (ProductID, PurchasedByUser, OtherAttributes)
 SELECT 23, ud.DBID, Yellow
 FROM Inventory U INNER JOIN Users ud 
 ON U.PurchasedByUser= ud.DBID AND ud.UserActive = 1 AND UserName = 'mathew'

我仍然对在这里尝试实现的目标感到困惑，你从库存中获取值并再次插入它。不确定。只是试图帮助你弄清楚查询！

Answer 4

您可以通过两个步骤完成此操作。首先获取用户的ID：

SELECT DBID
FROM Users
WHERE UserActive=1 AND UserName='mathew';

现在您拥有了用户的ID，您可以使用第二个查询将其插入Inventory表：

INSERT INTO Inventory (ProductID,PurchasedByUser,OtherAttributes )
VALUES(23,<THE-USER'S-ID>, 'Yellow');

我假设您知道如何在PHP中执行此操作，因为您不需要PHP代码

Answer 5

我相信23＆amp; Yellow是记录您quote需要mathew。

  INSERT INTO Inventory (ProductID, PurchasedByUser, OtherAttributes)
  SELECT 23, U.DBID, Yellow
  FROM Inventory U INNER JOIN Users ud 
  ON U.DBID = ud.DBID AND ud.UserActive = 1 AND UserName = mathew

到此

 INSERT INTO Inventory (ProductID, PurchasedByUser, OtherAttributes)
 SELECT ProductID, PurchasedByUser , OtherAttributes
 FROM Inventory U INNER JOIN Users ud 
 ON U.DBID = ud.DBID AND ud.UserActive = 1 AND UserName = 'mathew'

MySQL使用Inner Join中的值插入表中

5 个答案: