如何在此查詢中獲取用戶名和用戶名？ （MySQL）

Question

我已經想出了我的大部分SQL查詢，但我似乎需要一點幫助。

我似乎無法弄清楚如何使用social_posts.user_id從user中選擇username。

這裏是我的查詢（的作品）：

SELECT social_posts.user_id, social_posts.post_stamp, social_posts.message 
FROM social_posts 
WHERE id IN (
SELECT social_threads.id 
FROM social_threads, friends 
WHERE (((friends.user_a = ?) || (friends.user_b = ?)) && (friends.request = 1)) || (social_threads.user_id = ?) 
ORDER BY social_threads.id DESC) 
LIMIT 15 

我想查詢返回user.username。在user表中，用戶標識被稱爲id。

當我嘗試以下方法我得到一個錯誤：

SELECT social_posts.user_id, social_posts.post_stamp, social_posts.message, user.username 
FROM social_posts 
INNER JOIN user ON social_posts.user_id = user.id 

WHERE id IN (
SELECT social_threads.id 
FROM social_threads, friends 
WHERE (((friends.user_a = ?) || (friends.user_b = ?)) && (friends.request = 1)) || (social_threads.user_id = ?) 
ORDER BY social_threads.id DESC) 

LIMIT 15 

該查詢返回以下錯誤： Column 'id' in IN/ALL/ANY subquery is ambiguous

雖然這個工程：

SELECT social_posts.user_id, social_posts.post_stamp, social_posts.message, user.username 
FROM social_posts 
INNER JOIN user ON social_posts.user_id = user.id 
LIMIT 15 

任何幫助表示讚賞。

Answer 1

試試這個

SELECT social_posts.user_id, social_posts.post_stamp, social_posts.message, user.username 
FROM social_posts , user 
WHERE social_posts.id IN (
SELECT social_threads.id 
FROM social_threads, friends 
WHERE (((friends.user_a = ?) || (friends.user_b = ?)) && (friends.request = 1)) || (social_threads.user_id = ?) 
ORDER BY social_threads.id DESC) 
AND social_posts.user_id = user.id 
LIMIT 15 

我認爲Order By條款與內部查詢，