分段函数，列转行
2015-08-19 06:12
357 查看
SELECT
sum(CASE when score<60 then 1 else 0 end) AS '不及格',
sum(CASE when score>=60 and score<70 then 1 else 0 end) AS '差',
sum(CASE when score>=70 and score<80 then 1 else 0 end) AS '中',
sum(CASE when score>=80 and score<90 then 1 else 0 end) AS '良',
sum(CASE when score>=90 and score<=100 then 1 else 0 end) AS '优'
from student;
http://my.oschina.net/repine/blog/295961
sum(CASE when score<60 then 1 else 0 end) AS '不及格',
sum(CASE when score>=60 and score<70 then 1 else 0 end) AS '差',
sum(CASE when score>=70 and score<80 then 1 else 0 end) AS '中',
sum(CASE when score>=80 and score<90 then 1 else 0 end) AS '良',
sum(CASE when score>=90 and score<=100 then 1 else 0 end) AS '优'
from student;
http://my.oschina.net/repine/blog/295961
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