連接兩個表，條件是第一個表

Question

我想將這兩個變成一個SELECT語句：

SELECT * 
FROM activegroupmodel 
WHERE groupID = ? 
ORDER BY groupModelID DESC 
LIMIT 1

SELECT * 
FROM model 
WHERE modelID = ?

正如您從第一個groupID看到的不是pk，我想要該表中的最新模型。 我已經嘗試過了，但是顯然沒有用：

SELECT * 
FROM activegroupmodel as a 
WHERE a.groupID = ? 
ORDER BY a.groupModelID DESC 
LIMIT 1 
INNER JOIN model as m ON a.modelID = m.modelID

我已經用JOIN讀了很多問題，但是沒有一個與我的問題相符。 有人知道我該如何解決？ 最好的問候約翰

Answer 1

只需將JOIN放在WHERE條件之前，就像這樣：

SELECT * 
FROM activegroupmodel as a
INNER JOIN model as m ON a.modelID = m.modelID
WHERE a.groupID = ? 
ORDER BY a.groupModelID DESC 
LIMIT 1 

Answer 2

SELECT * 
FROM activegroupmodel as a 
INNER JOIN model as m ON a.modelID = m.modelID
WHERE a.groupID = ? 
ORDER BY a.groupModelID DESC 
LIMIT 1 

Answer 3

正確的連接語句應為

SELECT * 
FROM activegroupmodel as a 
INNER JOIN model as m ON a.modelID = m.modelID
WHERE a.groupID = ? 
ORDER BY a.groupModelID DESC 
LIMIT 1 

Answer 4

嘗試這個

SELECT * 
FROM activegroupmodel as a 
INNER JOIN model as m ON a.modelID = m.modelID
WHERE a.groupID = ? 
ORDER BY a.groupModelID DESC 
LIMIT 1