a) Pivot的时候，实际上也是一次分组，并且可以通过聚簇函数来实现统计
b) Pivot在取列名的时候，如果别名有汉字，要用双引号括起来，或者不用双引号
c) 如果对应的字段值为非数字或者字母，记得要用单引号引起来，比如下面的’A’
select *
from (select case
when a.score >= 220 and a.score <= 330 then
'(220,330)'
when a.score >= 630 and a.score <= 710 then
'(630,710)'
when a.score < 220 then
'其他'
else
'(' || (ceil((a.score - 330) / 20) * 20 + 330) || ',' ||
(ceil((a.score - 330) / 20 + 1) * 20 + 330) || ')'
end 分数段,
b.score
from SUBJECTREGISTER a
left join SUBJECTREGISTER b
on a.candidatesid = b.candidatesid
WHERE a.testid = '181'
and a.CAMPUSCODE LIKE '12%'
AND a.SUBJECTCODE != 'S'
AND a.SUBJECTCODE != 'F'
AND (a.SCORE != '0' AND a.SCORE IS NOT NULL and
b.score IS NOT NULL)
AND (b.SUBJECTCODE = 'S' or b.SUBJECTCODE = 'F')) pivot(count(SCORE) FOR SCORE IN('A' "A",
'A+' "A+",
'B' "B",
'B+' "B+",
'C' "C",
'C+' "C+",
'D' "D",
'D+' "D+"))
ORDER BY 分数段