MOODLE MySQL在SELECT部分​​语句中使用'和'

Question

在MOODLE中，我使用以下脚本来提取一些数字 - 而且它们很好：

SELECT
qc.name,
q.category,
SUM(IF(qs.grade = "1",1,0)) AS Correct,
SUM(IF(qs.grade = "0",1,0)) AS Wrong

FROM
mdl_question_states qs,
mdl_quiz_attempts qa,
mdl_quiz qz,
mdl_course c,
mdl_question q,
mdl_question_categories qc

WHERE
qa.id = qs.attempt
AND qs.event = 6
AND qa.quiz = qz.id
AND ((qz.name = 'Pre-Test') OR (qz.name = 'Post-Test'))
AND qz.course = c.id
AND q.id = qs.question
AND q.category = qc.id
AND q.category > 601

GROUP BY q.category

ORDER BY qc.name

我的问题是：我想要一个专栏（在'SUM（IF ...'列）之后是'正确-AND-预先测试'，然后是'正确-AND-后测试'。

用于完成此任务的语法是什么？

Answer 1

尝试

SUM(IF(sq.grade = '1' AND qz.name='pre-test', 1, 0)) AS cor_and_pre

和其他值类似。