MySQL允許在where子句

Question

這是我的SQL語句，我無法運行未知列錯誤：

SELECT fm . * , mp.first_name, mp.last_name, mp.image, mp.member_id 
FROM featured_members AS fm 
JOIN member_profiles AS mp WHERE fm.member_id = mp.member_id 
AND fm.member_type_id =6 
AND fm.site_id =1 

當我運行它，它給了我#1054 - Unknown column 'fm.site_id' in 'on clause'錯誤

是否有語法問題，因爲FM表確實有那個site_id列，但我不知道爲什麼SQL不提取它？

我對featured_members表結構是這樣的：

1 sr_no  
2 member_id  
3 member_type_id 
4 site_id 

和member_profiles結構：

1 member_profile_id 
2 member_id  
3 first_name  
4 middle_name 
5 last_name  
6 gender 
7 image 

Answer 1

你就錯了： 隨着JOIN的它是強制性使用ON子句，除非另外它是一個交叉連接。

SELECT fm . * , mp.first_name, mp.last_name, mp.image, mp.member_id 
FROM featured_members AS fm 
JOIN member_profiles AS mp ON (fm.member_id = mp.member_id) 
WHERE fm.member_type_id =6 
AND fm.site_id =1 

Answer 2

測試：

SELECT fm.*, mp.first_name, mp.last_name, mp.image, mp.member_id 
FROM featured_members AS fm 
LEFT JOIN member_profiles AS mp ON fm.member_id = mp.member_id 
WHERE fm.member_type_id =6 AND fm.site_id =1 

Answer 3

「ON」 的條款中缺少您的查詢和MySQL需要它。因此，Moddom提供的解決方案在我看來是正確的答案。

請參閱http://dev.mysql.com/doc/refman/5.0/en/join.html以及http://bugs.mysql.com/bug.php?id=13551。

Answer 4

嘗試......

SELECT fm . * , mp.first_name, mp.last_name, mp.image, mp.member_id 
FROM featured_members AS fm, member_profiles AS mp 
WHERE fm.member_id = mp.member_id 
AND fm.member_type_id =6 
AND fm.site_id =1 

在你的語句中的JOIN子句期待相應的其上是什麼原因造成的錯誤

Answer 5

試試這個： -

SELECT fm . * , mp.first_name, mp.last_name, mp.image, mp.member_id <br> 
FROM featured_members fm , member_profiles mp <br> 
where fm.member_id = mp.member_id <br> 
AND fm.member_type_id =6 <br> 
AND fm.site_id =1