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Hive分析窗口函数(一)SUM,AVG,MIN,MAX

时间：2021-07-01 10:21:17 帮助过：30人阅读

Hive中提供了越来越多的分析函数，用于完成负责的统计分析。抽时间将所有的分析窗口函数理一遍，将陆续发布。今天先看几个基础的，SUM、AVG、MIN、MAX。p用于实现分组内所有和连续累积的统计。/p CREATE EXTERNAL TABLE yeshuai_test( cookieid string, crea

Hive中提供了越来越多的分析函数，用于完成负责的统计分析。抽时间将所有的分析窗口函数理一遍，将陆续发布。
今天先看几个基础的，SUM、AVG、MIN、MAX。

用于实现分组内所有和连续累积的统计。
 
CREATE EXTERNAL TABLE yeshuai_test(
    cookieid string,
    createtime string, --day
    pv INT
    ) ROW FORMAT DELIMITED
    FIELDS TERMINATED BY ','

为了测试方便，不用到hadoop上去上传文件进行测试

直接进入本地的一个文件夹 进行编辑数据导入 ，这里我的文件夹路径为/home/work/yeshuai/data1.txt

用vim 编辑 ，复制进去数据


  • cookie1 2015-04-10 1
  • cookie1 2015-04-11 5
  • cookie1 2015-04-12 7
  • cookie1 2015-04-13 3
  • cookie1 2015-04-14 2
  • cookie1 2015-04-15 4
  • cookie1 2015-04-16 4


  • 然后 hive>select * from yeshuai_test 进行测试，有数据的话，测试环境准备ok了


    SUM — 注意,结果和ORDER BY相关,默认为升序

      SELECT cookieid,
    createtime,
    pv,
    SUM(pv) OVER(PARTITION BY cookieid ORDER BY createtime) AS pv1, -- 默认为从起点到当前行
    SUM(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS pv2, --从起点到当前行，结果同pv1
    SUM(pv) OVER(PARTITION BY cookieid) AS pv3,        --分组内所有行
    SUM(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) AS pv4, --当前行+往前3行
    SUM(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND 1 FOLLOWING) AS pv5, --当前行+往前3行+往后1行
    SUM(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS pv6 ---当前行+往后所有行
    FROM yeshuai_test;
     
    cookieid createtime pv pv1 pv2 pv3 pv4 pv5 pv6
    -----------------------------------------------------------------------------
    cookie1 2015-04-10 1 1 1 26 1 6 26
    cookie1 2015-04-11 5 6 6 26 6 13 25
    cookie1 2015-04-12 7 13 13 26 13 16 20
    cookie1 2015-04-13 3 16 16 26 16 18 13
    cookie1 2015-04-14 2 18 18 26 17 21 10
    cookie1 2015-04-15 4 22 22 26 16 20 8
    cookie1 2015-04-16 4 26 26 26 13 13 4


    pv1: 分组内从起点到当前行的pv累积，如，11号的pv1=10号的pv+11号的pv, 12号=10号+11号+12号
    pv2: 同pv1
    pv3: 分组内(cookie1)所有的pv累加
    pv4: 分组内当前行+往前3行，如，11号=10号+11号， 12号=10号+11号+12号， 13号=10号+11号+12号+13号， 14号=11号+12号+13号+14号
    pv5: 分组内当前行+往前3行+往后1行，如，14号=11号+12号+13号+14号+15号=5+7+3+2+4=21
    pv6: 分组内当前行+往后所有行，如，13号=13号+14号+15号+16号=3+2+4+4=13，14号=14号+15号+16号=2+4+4=10

    如果不指定ROWS BETWEEN,默认为从起点到当前行;
    如果不指定ORDER BY，则将分组内所有值累加;
    关键是理解ROWS BETWEEN含义,也叫做WINDOW子句：
    PRECEDING：往前
    FOLLOWING：往后
    CURRENT ROW：当前行
    UNBOUNDED：起点，UNBOUNDED PRECEDING 表示从前面的起点， UNBOUNDED FOLLOWING：表示到后面的终点

    –其他AVG，MIN，MAX，和SUM用法一样。

    1.   --AVG

    2.     SELECT cookieid,

    3.     createtime,

    4.     pv,

    5.     AVG(pv) OVER(PARTITION BY cookieid ORDER BY createtime) AS pv1, -- 默认为从起点到当前行

    6.     AVG(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS pv2, --从起点到当前行，结果同pv1

    7.     AVG(pv) OVER(PARTITION BY cookieid) AS pv3,        --分组内所有行

    8.     AVG(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) AS pv4, --当前行+往前3行

    9.     AVG(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND 1 FOLLOWING) AS pv5, --当前行+往前3行+往后1行

    10.     AVG(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS pv6 ---当前行+往后所有行

    11.     FROM lxw1234;

    12.     cookieid createtime pv pv1 pv2 pv3 pv4 pv5 pv6

    13.     -----------------------------------------------------------------------------

    14.     cookie1 2015-04-10 1 1.0 1.0 3.7142857142857144 1.0 3.0 3.7142857142857144

    15.     cookie1 2015-04-11 5 3.0 3.0 3.7142857142857144 3.0 4.333333333333333 4.166666666666667

    16.     cookie1 2015-04-12 7 4.333333333333333 4.333333333333333 3.7142857142857144 4.333333333333333 4.0 4.0

    17.     cookie1 2015-04-13 3 4.0 4.0 3.7142857142857144 4.0 3.6 3.25

    18.     cookie1 2015-04-14 2 3.6 3.6 3.7142857142857144 4.25 4.2 3.3333333333333335

    19.     cookie1 2015-04-15 4 3.6666666666666665 3.6666666666666665 3.7142857142857144 4.0 4.0 4.0

    20.     cookie1 2015-04-16 4 3.7142857142857144 3.7142857142857144 3.7142857142857144 3.25 3.25 4.0
    

    1.     --MIN

    2.     SELECT cookieid,

    3.     createtime,

    4.     pv,

    5.     MIN(pv) OVER(PARTITION BY cookieid ORDER BY createtime) AS pv1, -- 默认为从起点到当前行

    6.     MIN(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS pv2, --从起点到当前行，结果同pv1

    7.     MIN(pv) OVER(PARTITION BY cookieid) AS pv3,        --分组内所有行

    8.     MIN(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) AS pv4, --当前行+往前3行

    9.     MIN(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND 1 FOLLOWING) AS pv5, --当前行+往前3行+往后1行

    10.     MIN(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS pv6 ---当前行+往后所有行

    11.     FROM lxw1234;

    12.      

    13.     cookieid createtime pv pv1 pv2 pv3 pv4 pv5 pv6

    14.     -----------------------------------------------------------------------------

    15.     cookie1 2015-04-10 1 1 1 1 1 1 1

    16.     cookie1 2015-04-11 5 1 1 1 1 1 2

    17.     cookie1 2015-04-12 7 1 1 1 1 1 2

    18.     cookie1 2015-04-13 3 1 1 1 1 1 2

    19.     cookie1 2015-04-14 2 1 1 1 2 2 2

    20.     cookie1 2015-04-15 4 1 1 1 2 2 4

    21.     cookie1 2015-04-16 4 1 1 1 2 2 4
    

    1.     ----MAX

    2.     SELECT cookieid,

    3.     createtime,

    4.     pv,

    5.     MAX(pv) OVER(PARTITION BY cookieid ORDER BY createtime) AS pv1, -- 默认为从起点到当前行

    6.     MAX(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS pv2, --从起点到当前行，结果同pv1

    7.     MAX(pv) OVER(PARTITION BY cookieid) AS pv3,        --分组内所有行

    8.     MAX(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) AS pv4, --当前行+往前3行

    9.     MAX(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND 1 FOLLOWING) AS pv5, --当前行+往前3行+往后1行

    10.     MAX(pv) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS pv6 ---当前行+往后所有行

    11.     FROM lxw1234;

    12.      

    13.     cookieid createtime pv pv1 pv2 pv3 pv4 pv5 pv6

    14.     -----------------------------------------------------------------------------

    15.     cookie1 2015-04-10 1 1 1 7 1 5 7

    16.     cookie1 2015-04-11 5 5 5 7 5 7 7

    17.     cookie1 2015-04-12 7 7 7 7 7 7 7

    18.     cookie1 2015-04-13 3 7 7 7 7 7 4

    19.     cookie1 2015-04-14 2 7 7 7 7 7 4

    20.     cookie1 2015-04-15 4 7 7 7 7 7 4

    21.     cookie1 2015-04-16 4 7 7 7 4 4 4


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