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我有如下表自然连接和左连接在一起在MySQL
- 问题 - > ID,question_data邀请,USER_ID
- 用户 - > ID,FNAME,LNAME
- question_connect-> ID,question_id, USER_ID
我最初的查询结果如下
select questions.id, questions.question_data, users.id, users.fname from questions, users where questions.user_id = users.id limit 30
但在这里,我想对这个问题的用户数,所以我尝试下面的查询
select questions.id, questions.question_data, users.id, users.fname, count(questions_connect.id) from questions, users LEFT JOIN questions_connect ON `questions`.`id` = `questions_connect`.`question_id` where questions.user_id = users.id group by `questions_connect`.`id` limit 30
这显示错误
Unknown column 'questions.id' in 'on clause'
SO才能让1个通话与自然连接和左连接和如果是的话,我去哪里错了..?
是的,工作...! :) 谢谢...! – KuKu 2012-04-11 05:58:25