窗口函数sum(sum(ws_sales_price)) over (partition by ws_item_sk order by d_date rows between unbounded preceding and current row)的含义是:以ws_item_sk为分组,以d_date为顺序,计算从开始截止到当天累计销售额。 三. Window子句 通过这个语句,细心的读者可以发现,窗口函数基本都是相同的格式partition by...
rows between 1 preceding and current row 的含义及解释如下: 含义: rows between 1 preceding and current row 是SQL窗口函数中的一个子句,用于指定窗口函数的计算范围。 具体来说,这个子句表示窗口函数将应用于当前行及其前一行。也就是说,对于每一行,窗口函数将考虑该行本身和它直接前面的一行。SQL...
unbounded preceding and unbouned following的意思针对当前所有记录的前一条、后一条记录,也就是表中的所有记录。那么假如我们直接指定从第一条记录开始直至末尾呢?看看下面的结果: SQL > select month , 2 sum (tot_sales) month_sales, 3 sum ( sum (tot_sales)) over ( order by month 4 rows between...
第三步:编写窗口函数查询 接下来,我们将编写一个 SQL 查询,以计算每位客户的累计销售额。为了实现这一点,我们将使用SUM函数,并结合ROWS BETWEEN来指明窗口的起始位置。 SELECTcustomer_id,transaction_date,amount,SUM(amount)OVER(PARTITIONBYcustomer_idORDERBYtransaction_dateROWSBETWEENUNBOUNDEDPRECEDINGANDCURRENTROW)A...
很幸运的是Oracle考虑到了我们这个需求,为此我们只需要将语句稍微改成: curreent row就可以了。 SQL > select month , 2 sum (tot_sales) month_sales, 3 sum ( sum (tot_sales)) over ( order by month 4 rows between unbounded preceding and current row ) current_total_sales 5 from orders 6 ...
SQL --- between 和< > 2019-10-10 11:54 −between值 and 值 运算符用于选取介于两个值之间的数据范围内的值,常与where一块使用between运算符选择给定范围内的值。值可以是数字,文本或日期。 使用between的时候会与and 一块连用,表示在啥啥之间,是不是让我们想起来大于某个小于某个 注意: 在某些数据库...
sql select cookieid, dt, pv, sum(pv) over(partition by cookieid order by dt) as pv1, sum(pv) over(partition by cookieid order by dt rows between unbounded preceding and current row) as pv2, sum(pv) over(partition by cookieid) as pv3, sum(pv) over(partition by cookieid order ...
sum(cost) over(PARTITION BY NAME ORDER BY p_date ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS sample4,--和sample3一样,由起点到当前行的聚合 sum(cost) over(PARTITION BY NAME ORDER BY p_date ROWS BETWEEN 1 PRECEDING AND CURRENT ROW) AS sample5,--前面一行和当前行做聚合 ...
把语句中的: ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING 改为: ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW 后,使用druid能正常执行; 因此:推断druid的SQL Parser不支持 ROWS BETWEEN xxxxxx PRECEDING AND xxxxx PRECEDING场景。
(I tried the query on shell.duckdb.org and it results in a memory access error.) To Reproduce import duckdb print( duckdb.sql(""" from (select unnest(generate_series(5000)) as row_number) select list(row_number) over(rows between unbounded preceding and current row) """) ) OS: macOS...