50个SQL语句(MySQL版)问题二十三

SELECT sc.S_CId "课程ID", course.Cname "课程名称",
SUM(CASE WHEN sc.Score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) "[100-85]",
SUM(CASE WHEN sc.Score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) "[85-70]",
SUM(CASE WHEN sc.Score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) "[70-60]", 
SUM(CASE WHEN sc.Score<60 THEN 1 ELSE 0 END) "[<60]"
FROM sc,course
where sc.S_CId=course.CId
GROUP BY sc.S_CId;