SQL + Ion Auth + CodeIgniter？

Question

我有以下SQL：

SELECT (
(SELECT SUM(vote_score)
FROM question_votes 
JOIN questions
ON vote_question = q_id
JOIN users
ON q_author = users.id
WHERE q_author` = users.id) 
+ 
(SELECT SUM(vote_score)
FROM answer_votes 
JOIN answers 
ON vote_answer = a_id
JOIN users
ON a_author = users.id
WHERE a_author = users.id)) AS rep

我想在此处添加它（Ion Auth的方法）：

    $this->db->select(
            array(
                $this->tables['users'].'.*',
                $this->tables['groups'].'.name AS '. $this->db->protect_identifiers('group'),
                $this->tables['groups'].'.description AS '. $this->db->protect_identifiers('group_description'),
                "(SELECT COUNT(`a_author`) FROM `answers` WHERE a_author = users.id) + (SELECT COUNT(`q_author`) FROM `questions` WHERE q_author = users.id )  AS total_posts",
                "SELECT 
((SELECT SUM(vote_score)
FROM question_votes 
JOIN questions
ON vote_question = q_id
JOIN users
ON q_author = users.id
WHERE q_author` = users.id) 
+ 
(SELECT SUM(vote_score)
FROM answer_votes 
JOIN answers 
ON vote_answer = a_id
JOIN users
ON a_author = users.id
WHERE a_author = users.id)) AS rep"
            )
        );

但是我得到了以下错误：

Answer 1

您是否阅读了错误消息？

你有一个（`）不应该是任何人。

更改此内容：WHERE q_author'= users.id：WHERE q_author = users.id