between unbounded preceding and current row) as sum3 from cookie1; order by : 在同一个组内，先累加完相同createtime...unbounded : 起点 preceding : 往前 following : 往后 between...end... : 指定操作的范围 current row : 当前行，计算到哪一行就是哪一行...between unbounded preceding and current row : 从起点到当前行，往前(对应表中的从上到下的顺序)累加 默认就是从起点到当前行往前累加，所以between...unbounded preceding and current row这个条件可以不写。...rows between current row and unbounded following) as avg4, avg(pv) over(partition by cookieid order
between unbounded preceding and current row) as pv2 from it_t2; select cookieid,createtime,pv,...往前 - following：往后 - current row：当前行 - unbounded：起点 - unbounded preceding 表示从前面的起点 - unbounded... between unbounded preceding and current row) as pv2 from it_t2; select cookieid,createtime,pv,...max(pv) over(partition by cookieid order by createtime rows between unbounded preceding and current row... between unbounded preceding and current row) as pv2 from it_t2; ---- 博客主页：https://lansonli.blog.csdn.net
| range) between (unbounded | [num]) preceding and ([num] preceding | current row | (unbounded | [num...]) following) (rows | range) between current row and (current row | (unbounded | [num]) following) (rows...，也没有出现order by，窗口默认为rows between UNBOUNDED PRECEDING and UNBOUNDED FOLLOWING ②在over()中(没有出现windows_clause...)，指定了order by，窗口默认为rows between UNBOUNDED PRECEDING and CURRENT ROW 窗口函数和分组有什么区别？...between 2 PRECEDING and CURRENT row) from business 当前+前一次+后一次: select name,orderdate,cost,sum(cost
BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ) as cm_cost from material_data md; 改造后的SQL和最开始的查询SQL达成的效果是一致的..., 我们可以看到改造SQL在 order by 后加了一段代码： ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW 小编为大家拆解一下这个代码，第一个 ROWS...这里可以扩展说明一下，确定计算窗口大小的关键字 除了UNBOUNDED PRECEDING和CURRENT ROW 之外还有 UNBOUNDED FOLLOWING, 如果 UNBOUNDED PRECEDING...所以如果指定计算窗口为 ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING, 则表示在整个分区计算域中进行聚合运算。...BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ) as material_num from material_data md; 也可以简写为 select
between unbounded preceding and current row ) running_sum_ytd from sales_fact where...把rows between unbounded preceding and current row修改为rows between unbounded preceding and unbounded...原因在于rows between unbounded preceding and current row是一种窗口函数，是相关分析函数的默认值，如果知道那个为unbounded following...between unbounded preceding and current row ) max_sale from sales_fact where country...between unbounded preceding and current row 得到的数据是截止到指定时间的最大值，而rows between unbounded preceding and
窗口范围说明： 我们常使用的窗口范围是ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW（表示从起点到当前行），常用该窗口来计算累加。...PRECEDING：往前 FOLLOWING：往后 CURRENT ROW：当前行 UNBOUNDED：起点（一般结合PRECEDING，FOLLOWING使用） UNBOUNDED PRECEDING...表示该窗口最前面的行（起点） UNBOUNDED FOLLOWING：表示该窗口最后面的行（终点） 比如说： ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT...1 CURRENT ROW（表示往前2行到当前行） ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING（表示当前行到终点） 2、常与over()一起使用的分析函数...between unbounded preceding and current row)as total from test_window where score > 80; 案例二： 1、查询在
between unbounded preceding and current row) as score1, sum(score) over (partition by class order...between 3 preceding and current row) as score4, sum(score) over (partition by class order by student...rows between 3 preceding and 1 following) as score5, sum(score) over (partition by class order by...student rows between current row and unbounded following) as score6 from math; 上述的代码解释： 如果不指定ROWS...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
| RANGE) BETWEEN (UNBOUNDED | [num]) PRECEDING AND ([num] PRECEDING | CURRENT ROW | (UNBOUNDED | [num...]) FOLLOWING) (ROWS | RANGE) BETWEEN CURRENT ROW AND (CURRENT ROW | (UNBOUNDED | [num]) FOLLOWING) (ROWS...BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW....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...(sales) OVER(PARTITION BY user_type ORDER BY sales asc ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
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...BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS pv2, --以id分组内所有行pv累加 SUM(pv) OVER(PARTITION...UM(pv) OVER(PARTITION BY id ORDER BY date ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS pv6...这是因为last_value默认的窗口是RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW，表示当前行永远是最后一个值，需改成RANGE BETWEEN...RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING：表示从当前行到最后一行。
, frame_end: { CURRENT ROW | UNBOUNDED PRECEDING | UNBOUNDED FOLLOWING | expr PRECEDING |...UNBOUNDED PRECEDING AND CURRENT ROW) AS AVGFROM Marks; ?...： CURRENT ROW: 当前行 UNBOUNDED PRECEDING: 区间的第一行 UNBOUNDED FOLLOWING：区间的最后一行 N PRECEDING: 当前行之前的N行，可以是数字...UNBOUNDED PRECEDING AND CURRENT ROW) AS '最高分' FROM Marks; ?...UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS '最高分' FROM Marks; ?
""" --方法4 select month, sum(money) over(order by month rows between unbounded preceding and...current row) as sum_money from test """ preceding：往前 following：往后 current row：当前行 unbounded：无界限...（起点或终点） unbounded preceding：表示从前面的起点 unbounded following：表示到后面的终点 当order by后面缺少窗口从句条件，窗口规范默认是 row between...unbounded preceding and current row....（从起点到当前行） 当order by和窗口从句都缺失, 窗口规范默认是 row between unbounded preceding and unbounded following.
BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS cumulative_qty FROM wip_order_test; ?...解释一下：还是用 SUM 来计算总和，这里我们使用了新的语法， ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW 定义了窗口的起点和终点，UNBOUNDED...BETWEEN 2 PRECEDING AND CURRENT ROW) AS cumulative_qty2, SUM(order_qty) OVER (ORDER BY order_no ROWS...ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) AS last_value, nth_value(order_qty,2) OVER (ORDER BY order_no...ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) AS second_value FROM wip_order_test; ?
UNBOUNDED PRECEDING AND CURRENT ROW，表示当前行永远是最后一个值，需改成RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED...此外： RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW：为默认值，即当指定了ORDER BY从句，而省略了window从句 ，表示从开始到当前行（当前行永远是最后一个值...RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING：表示从当前行到最后一行。...BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS pv2, --从起点到当前行，结果同pv1 SUM(pv) OVER(PARTITION...BY id ORDER BY time ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS pv6 ---当前行+往后所有行 FROM data
preceding），对range,如果order by是数字，对应的窗口中的表达式必须是数字或current row或unbounded，如果是日期，可以对应数字、两个interval函数、current...如果range中的order by有多个排序键值，那么窗口中只能用unbounded,current row。...相当于range between unbounded preceding and current row (相同排序值范围一样). 3.)有window,也就必须有order by,如果没有between...比如rows 1 preceding相当于rows between 1 preceding and current row,range 1 preceding相当于range between 1 preceding...4.）0 following和0 preceding都相同于current row。
：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...between unbounded preceding and current row) sample4, --和sample3一样的效果 sum(cost) over(partition by name...order by cost rows between 1 preceding and current row) sample5, -- 当前行和上一行相加 sum(cost) over(partition...by name order by cost rows between 1 preceding and 1 following) sample6, -- 上一行、当前行、后一行相加 sum(cost)...over(partition by name order by cost rows between current row and unbounded following) sample7 -- 当前行到末尾
如果没有指定frame_clause，则默认为RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW，即从分区开始到当前行。 引用自网上 二....BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW), w3 AS (w2 RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT...BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS cumulative_profit FROM sales ORDER BY country, profit...BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW作为窗口范围，表示从分区开始到当前行。...BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) ORDER BY country, profit ; 输出结果： +---------+----------
month, tmp2.total_month, sum(tmp2.total_month) over(partition by userId order by tmp2.month rows...between unbounded preceding and current row) from (select tmp1.userId, tmp1.month...(s) 分析 1、从需求来看，需要计算每个月的访问结果和截至当月累计和，并一起展示，必然用到开窗，这个在hive sql系列一讲过了 2、累计效果需要用到rows范围 3、这里日期格式不能直接用，需要用...between unbounded preceding and current row) 知识点 rows是行数的意思，后面跟的是函数的范围 between是行数在什么范围 unbounded是行数的起点...,这里可以将unbounded替换成1，那就是相邻上一个月的意思 preceding是前面的意思 current row是当前行的意思 连一起的意思是参与计算的行数是从起点开始直到当前行，这就是开窗的数据范围
行范围可以是固定的行数（如ROWS BETWEEN 2 PRECEDING AND CURRENT ROW），也可以是相对于当前行的动态范围（如ROWS BETWEEN UNBOUNDED PRECEDING...而ROWS则简单地基于行的物理顺序来计算窗口。 ROWS子句的常用选项 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW：从窗口的开始到当前行。...ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW 定义了窗口范围，从分区的第一行到当前行。...salesperson_id ORDER BY sales_date ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS max_sales,...ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW 确保了窗口从当前分区的第一行开始，到当前行为止。
有两种语法指定窗口函数的范围: BETWEEN AND 如果只有“开始点”，默认结束点为CURRENT...UNBOUNDED 关键字指定分区开端或者结束。CURRENT ROW 指定当前行是否是窗口的开始或者结束，这取决于窗口使用的位置。上图中的“N”指定了之前当前列的或之后的行数。...下面是有效规范的窗口函数: -- 从分区中指定整个结果集 BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING -- 指定五行，并且在当前行的前四行...BETWEEN 4 PRECEDING AND CURRENT ROW -- 指定当前行到分区结束的所有行 BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING...BETWEEN 1 PRECEDING AND CURRENT ROW) AS Last2Count FROM @Test ORDER BY Account, TranDate; 查询返回如下结果
| frame_between} frame_between: BETWEEN frame_start AND frame_end frame_start, frame_end: { CURRENT...ROW | UNBOUNDED PRECEDING | UNBOUNDED FOLLOWING | expr PRECEDING | expr FOLLOWING } 这里分为两块，一块是 frame_units...in set (0.00 sec) 1、CURRENT ROW 表示获取当前行记录，也就是边界是当前行，等值关系 mysql: ytt_80 > select id,r1,sum(r1) over...(partition by id order by r1 asc range current row ) as wf_result from t1 where id = 1; +------+-----...r1 asc rows between unbounded preceding and unbounded following ) as wf_result from t1 where id = 1;
领取专属 10元无门槛券
手把手带您无忧上云
云服务器
ICP备案
实时音视频
云直播
对象存储
