MOODLE MySQL在語句的SELECT部分​​使用'and'

Question

在MOODLE中，我正在使用以下腳本提取一些數字-它們很好地表現出來：

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

我的問題是：我想有一列（在“ SUM（IF ...”列之后），然后是“正確-AND-測試后”，然后是“正確-AND-測試前”。

完成此操作要使用什么語法？

Answer 1

嘗試

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

同樣，其他值也是如此。