錯誤代碼：1064.您的SQL語法錯誤; 3臺MySQL的加入

Question

我收到以下錯誤，當我試圖把火關查詢用mysql加入3個表：

錯誤代碼：1064您的SQL語法錯誤;檢查對應於您的MySQL服務器版本的使用近「組INNER JOIN mahara.group_member作爲group_members ON GROUP_ID =構件」在列正確的語法手動6

MySQL是：

SELECT `mahara.group.id` as group_id, 
     `mahara.group.name` as group_name, 
     `mahara.group_member.member` as member_id, 
     `mahara.group_member.group` as member_groupid, 
     `mahara.usr.id` as user_id 
FROM `mahara.group` as group 
    INNER JOIN `mahara.group_member` as group_members ON group_id = member_id, 
    INNER JOIN `mahara.usr` as users ON member_id = user_id 
LIMIT 0, 200; 

對於生活我看不到我做錯了什麼。任何幫助讚賞。

乾杯

Answer 1

您的查詢有幾個問題。

首先，您嘗試使用保留字group創建別名。您必須使用反引號來避開保留字。另外，您應該在表和列名稱周圍有單獨的反引號集，它們不應該包含在一對中。

二，您在表格mahara.group_member後加逗號後的逗號後應加上member_id,。

查詢應該是：

SELECT `group`.`id` as group_id, 
     `group`.`name` as group_name, 
     group_members.`member` as member_id, 
     group_members.`group` as member_groupid, 
     users.`usr.id` as user_id 
FROM `mahara`.`group` as `group` 
INNER JOIN `mahara`.group_member` as group_members 
    ON group_id = member_id 
INNER JOIN `mahara`.`usr` as users 
    ON member_id = user_id 
LIMIT 0, 200; 

作爲一個方面，注意你應該避免使用reserved words作爲表，列和別名的名字。