使用sum over partition by来计算累积值

Question

我正在运行以下代码来计算累积值

SELECT
    iid
    ,item_id
    ,pg_purch_ind
    ,SUM_score1
    ,SUM(pg_purch_ind) OVER(PARTITION BY item_id ORDER BY SUM_score1 DESC, iid % 100, iid ) AS cum_pg_purch
into table2
FROM table1 

但它有以下错误“'order'附近的语法不正确。”有谁知道这是什么问题？

Answer 1

以下是较小版本的解决方法

;WITH cte
     AS (SELECT iid,
                item_id,
                pg_purch_ind,
                SUM_score1,
                Row_number()OVER(partition BY item_id ORDER BY SUM_score1 DESC, iid % 100, iid ) AS rn
         FROM   Yourtable)
SELECT iid,
       item_id,
       pg_purch_ind,
       SUM_score1,
       cum_pg_purch
FROM   cte a
       CROSS apply (SELECT Sum (pg_purch_ind)
                    FROM   cte b
                    WHERE  a.item_id = b.item_id
                           AND b.rn <= a.rn) cs (cum_pg_purch) 

由于模运算符

，在生成Row_Number时很难处理交叉应用Where子句