1.資料
s1,201801,A
s1,201802,A
s1,201803,C
s1,201804,A
s1,201805,A
s1,201806,A
s2,201801,A
s2,201802,B
s2,201803,C
s2,201804,A
s2,201805,D
s2,201806,A
s3,201801,C
s3,201802,A
s3,201803,A
s3,201804,A
s3,201805,B
s3,201806,A
2.建表
create table if not exists student(name string,month string,degree string)
row format delimited
fields terminated 
 
by ','
;
load data local inpath '/root/stu.txt' into table student;
3.現要查詢表中連續三個月以上degree均為A的記錄？
select
    a1.name,
    a1.month,
    a1.degree
from
(
    select
        name,
        month,
        degree,
        sum(if(degree = 'A', 1, 0)) OVER(PARTITION BY name ORDER BY month ROWS BETWEEN 2 PRECEDING AND
 
 CURRENT ROW) AS score1,
        sum(if(degree = 'A', 1, 0)) OVER(PARTITION BY name ORDER BY month ROWS BETWEEN 1 PRECEDING AND 1 following) AS score2,
        sum(if(degree = 'A', 1, 0)) OVER(PARTITION BY name ORDER BY month ROWS BETWEEN  CURRENT ROW AND 2 following) AS score3
    from student
) as a1
 
where
    a1.score1 = 3 or
    a1.score2 = 3 or
    a1.score3 = 3
結果：
s1      201804  A
s1      201805  A
s1      201806  A
s3      201802  A
s3      201803  A
s3      201804  A