我有两个表，一个是表，其中包含以下结构enter image description here
表2中包含以下数据enter image description here
在示例(CASE WHEN SUBSTR(A.total, 1, 2) >= 70 THEN "A" WHEN SUBSTR(A.total, 1, 2) >= 60 THEN "B" WHEN SUBSTR(A.total, 1, 2) >= 50 THEN "C" WHEN SUBSTR(A.total, 1, 2) >= 40 THEN "D" WHEN SUBSTR(A.total, 1, 2) <= 39 THEN "F" END)
这是完整的查询
INSERT INTO promotion_result
(adm,
subject,
first,
second,
third,
session,
class,
total,
grade)
SELECT DISTINCT a.admission_no,
a.subject,
Ifnull((SELECT b.total
FROM result b
WHERE b.admission_no = a.admission_no
AND a.subject = b.subject
AND b.term = 'First'), 0) AS first,
Ifnull((SELECT b.total
FROM result b
WHERE b.admission_no = a.admission_no
AND a.subject = b.subject
AND b.term = 'Second'), 0) AS second,
Ifnull((SELECT b.total
FROM result b
WHERE b.admission_no = a.admission_no
AND a.subject = b.subject
AND b.term = 'Third'), 0) AS third,
'2018/2019',
'JS2',
Sum(a.total / 3) AS total,
CASE
WHEN a.total >= B.mark THEN 'A'
ELSE 'F'
END
FROM result a
INNER JOIN grade B
ON Substr(a.class, 1, 2) = B.class
WHERE a.session = '2018/2019'
AND a.class = 'JS2'
AND a.admission_no = 'JS177'
GROUP BY a.admission_no
