MySQL錯誤說明：在第未知列

我想放在一起，從多個表中提取數據的查詢，但我發現了一個奇怪的錯誤：MySQL錯誤說明：在第未知列

Error Code: 1054. Unknown column 'esjp_layout.section_id' in 'on clause'

表和列引用當然存在，並且拼寫正確。這是我正在處理的查詢。任何想法有什麼不對？

SELECT 
    esjp_section_refs.section_label, 
    esjp_content.primary_key, esjp_content.content, esjp_content.summary_id, 
    esjp_role_refs.role_label, 
    esjp_users.first_name, esjp_users.last_name, 
    FROM_UNIXTIME(esjp_content.sys_time) 
FROM esjp_content 
    INNER JOIN esjp_section_refs ON esjp_layout.section_id = esjp_section_refs.primary_key 
    INNER JOIN esjp_layout ON esjp_content.primary_key = esjp_layout.content_id 
    INNER JOIN esjp_role_refs ON esjp_content.role_ref = esjp_role_refs.primary_key 
    INNER JOIN esjp_users ON esjp_content.author_id = esjp_users.primary_key 
WHERE esjp_layout.primary_key = 1 
ORDER BY esjp_layout.section_id ASC, esjp_layout.position ASC ;

P.S.我知道這個查詢有點羅嗦，但它是以編程方式組裝的，所以字符數不關心我。

來源

2016-06-14 Jim Fell

表「esjp_layout」中可能存在名爲「section_id」的列。但是，當然不是在您試圖使用特定ON子句_連接的表「esjp_content」或「esjp_section_refs」中。 – arkascha

問題是您的ON子句中正在加入的表尚未在查詢中。

相反：

SELECT 
    esjp_section_refs.section_label, 
    esjp_content.primary_key, esjp_content.content, esjp_content.summary_id, 
    esjp_role_refs.role_label, 
    esjp_users.first_name, esjp_users.last_name, 
    FROM_UNIXTIME(esjp_content.sys_time) 
FROM esjp_content 
    INNER JOIN esjp_layout ON esjp_content.primary_key = esjp_layout.content_id 
    INNER JOIN esjp_section_refs ON esjp_layout.section_id = esjp_section_refs.primary_key  
    INNER JOIN esjp_role_refs ON esjp_content.role_ref = esjp_role_refs.primary_key 
    INNER JOIN esjp_users ON esjp_content.author_id = esjp_users.primary_key 
WHERE esjp_layout.primary_key = 1 
ORDER BY esjp_layout.section_id ASC, esjp_layout.position ASC ;

在您必須通過其連接到一個表已在您的查詢在表中加入其他的話。可以這麼說，他們必須按順序加入。

來源

2016-06-14 20:56:11 JNevill

謝謝，那就是訣竅！ –

你以後就接近加盟esjp_layout，嘗試，如果有可能，所以開關這個當上條hists，該表已經加入了對

FROM_UNIXTIME(esjp_content.sys_time) 
    FROM esjp_content 
    INNER JOIN esjp_section_refs ON **esjp_layout.section_id** = esjp_section_refs.primary_key 
    INNER JOIN **esjp_layout** ON esjp_content.primary_key = esjp_layout.content_id

來源

2016-06-14 20:56:14 irimawi

您可以使用一個表，你加入後，才。因此，將連接順序切換爲

SELECT 
    esjp_section_refs.section_label, 
    esjp_content.primary_key, esjp_content.content, esjp_content.summary_id, 
    esjp_role_refs.role_label, 
    esjp_users.first_name, esjp_users.last_name, 
    FROM_UNIXTIME(esjp_content.sys_time) 
FROM esjp_content 
    INNER JOIN esjp_layout ON esjp_content.primary_key = esjp_layout.content_id 
    INNER JOIN esjp_section_refs ON esjp_layout.section_id = esjp_section_refs.primary_key   
    INNER JOIN esjp_role_refs ON esjp_content.role_ref = esjp_role_refs.primary_key 
    INNER JOIN esjp_users ON esjp_content.author_id = esjp_users.primary_key 
WHERE esjp_layout.primary_key = 1 
ORDER BY esjp_layout.section_id ASC, esjp_layout.position ASC ;

來源

2016-06-14 20:56:22

MySQL錯誤說明：在第未知列

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