我的目标是做一个聚合函数(sum)并对元素进行分组,但是有一个错误
这是我所做的所有步骤
1-第一步代码
SELECT ca.question_id , ca.choice_0 ,ca.choice_1 ,ca.choice_2 ,ca.choice_3 ,ca.choice_4 ,q.headline_id FROM closed_answers ca
INNER JOIN questions q ON ca.question_id = q.id
INNER JOIN headline h ON q.headline_id = h.id
INNER JOIN forms f ON h.form_id = f.id
WHERE f.id = 2
结果
http://img717.imageshack.us/img717/685/firststep.png
2-现在我想汇总选择并按标题ID对它们进行分组,但是当我写
SELECT sum(ca.choice_0) ,sum(ca.choice_1) ,sum(ca.choice_2) ,sum(ca.choice_3) ,sum(ca.choice_4) ,q.headline_id FROM closed_answers ca
INNER JOIN questions q ON ca.question_id = q.id
INNER JOIN headline h ON q.headline_id = h.id
INNER JOIN forms f ON h.form_id = f.id
GROUP BY q.headline_id
WHERE f.id = 2
错误是
A Database Error Occurred
Error Number: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE f.id = 2' at line 6
SELECT sum(ca.choice_0) ,sum(ca.choice_1) ,sum(ca.choice_2) ,sum(ca.choice_3) ,sum(ca.choice_4) ,q.headline_id FROM closed_answers ca INNER JOIN questions q ON ca.question_id = q.id INNER JOIN headline h ON q.headline_id = h.id INNER JOIN forms f ON h.form_id = f.id GROUP BY q.headline_id WHERE f.id = 2
PS:当我按关键字删除组并总结所有选择时,它会起作用