Question

我正在尝试执行以下操作。

加入2个表=＆gt;获得结果

第一次加入的结果我需要它加入另一张桌子

这就是我所拥有的

SELECT 
    T1.*, T2.*
FROM 
    (SELECT * 
     FROM ProductPackType ppt
     JOIN ProductPack pp ON ppt.ProductPackTypeID = pp.ProductPackTypeID
     WHERE pp.Acronym = 'IS') AS T1
JOIN 
    (SELECT * FROM PRODUCT) AS T2 ON T1.ProductPackID = T2.ProductPackID

这是错误消息

Msg 8156，Level 16，State 1，Line 10
“T1”
多次指定“名称”列

我在这里做错了什么？

谢谢

Answer 1

ProductPackType和ProductPack表中都有列名。尝试类似：

SELECT 
    T1.*, T2.*
FROM 
    (SELECT ppt.Name, pp.Name as ppName --add the rest of your wanted columns...
     FROM ProductPackType ppt
     JOIN ProductPack pp ON ppt.ProductPackTypeID = pp.ProductPackTypeID
     WHERE pp.Acronym = 'IS') AS T1
JOIN 
    (SELECT * FROM PRODUCT) AS T2 ON T1.ProductPackID = T2.ProductPackID

正如你所看到的，我试图避免在T1表格中由于加入的查询而导致两列名称为＆＃39; Name＆＃39; （这里奇怪的文字游戏）。

你甚至可以写一些更短的东西：

SELECT ppt.*, pp.Name as ppName --and the rest of the pp columns

Answer 2

为什么不忘记所有子查询的东西，只是一起加入表格？

SELECT * 
FROM ProductPackType ppt
JOIN ProductPack pp ON ppt.ProductPackTypeID = pp.ProductPackTypeID
JOIN PRODUCT p ON p.ProductPackID = ppt.ProductPackID
WHERE pp.Acronym = 'IS'

Answer 3

你可能有＆＃34; name＆＃34;来自＆＃34; ppt＆＃34;和＆＃34; pp＆＃34;，尝试以下

SELECT 
    T1.*, T2.*
FROM 
    (SELECT ppt.*, pp.*
     FROM ProductPackType ppt
     JOIN ProductPack pp ON ppt.ProductPackTypeID = pp.ProductPackTypeID
     WHERE pp.Acronym = 'IS') AS T1
JOIN 
    (SELECT * FROM PRODUCT) AS T2 ON T1.ProductPackID = T2.ProductPackID

SQL Server使用另一个表加入结果

3 个答案: