加入第一臺

Question

與條件的兩個表我想使這兩個成一個SELECT語句：

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

SELECT * 
FROM model 
WHERE modelID = ? 

你可以從第一組ID所看到的不是一個PK，我想從最新型號表。 心中已經試過，但它顯然沒有奏效：

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 

我讀了一堆帶着疑問加入，但他們沒有我的問題相匹配。有人知道我能如何解決這個問題嗎？ 最好的問候約翰

Answer 1

只是把WHERE條件之前你的加盟，這樣的：

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

正確連接語句應儘可能

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

試試這個

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