SNOWFLAKE 函数 SUM 不支持累积窗框

Posted 2023-03-31

【中文标题】SNOWFLAKE 函数 SUM 不支持累积窗框

【英文标题】：SNOWFLAKE Cumulative window frame unsupported for function SUM

【发布时间】：2021-10-26 13:16:57

【问题描述】：

我正在使用 SNOWFLAKE snowflake 数据库。 我正在尝试使用雪花SNOWFLAKE_SAMPLE_DATA数据库的一些Windows操作员，我遇到了累积函数的情况。

不工作的 SQL 如下：

SELECT 
SUM( C_BIRTH_DAY )
OVER (PARTITION BY
     C_BIRTH_MONTH,
     C_BIRTH_YEAR 
     ORDER BY
     NVL(C_BIRTH_COUNTRY,'COSTA RICA')
     RANGE BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) AS MAX1,
MIN( C_BIRTH_DAY )
OVER ( PARTITION BY C_BIRTH_MONTH ,
     C_BIRTH_YEAR 
     ORDER BY
     NVL(C_BIRTH_COUNTRY,'COSTA RICA')
     ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) AS MIN1
FROM  CUSTOMER;

提供的 SQL 将失败并返回错误消息： SNOWFLAKE Cumulative window frame unsupported for function SUM.

并且预期的结果是应该执行查询。

我用几个运算符 AVG,MAX,SUM 尝试了这个查询，结果都一样。

查看documentation 看起来语法很好：

对于累积窗口

cumulativeFrame ::=
    
        ROWS | RANGE  BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
     |  ROWS | RANGE  BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
    

对于滑动窗口：

slidingFrame ::=
    
       ROWS BETWEEN <N>  PRECEDING | FOLLOWING  AND <N>  PRECEDING | FOLLOWING 
     | ROWS BETWEEN UNBOUNDED PRECEDING AND <N>  PRECEDING | FOLLOWING 
     | ROWS BETWEEN <N>  PRECEDING | FOLLOWING  AND UNBOUNDED FOLLOWING
    

所以我目前找不到这个错误的解释。

【参考方案1】：

在尝试了各种各样的事情后，我发现如果我切换窗口语法而不是使用 RANGE，我会使用这样的行：

SELECT 
SUM( C_BIRTH_DAY )
OVER (PARTITION BY
     C_BIRTH_MONTH,
     C_BIRTH_YEAR 
     ORDER BY
     NVL(C_BIRTH_COUNTRY,'CR')
     ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) AS MAX1,
MIN( C_BIRTH_DAY )
OVER ( PARTITION BY C_BIRTH_MONTH ,
     C_BIRTH_YEAR 
     ORDER BY
     NVL(C_BIRTH_COUNTRY,'CR')
     ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) AS MIN1
FROM  CUSTOMER;

有效！！