尝试划分列，它在 SQL 中返回除以零的错误答案

【问题标题】：Trying to divide the columns and it's returning error division by zero in SQL尝试划分列，它在 SQL 中返回除以零的错误
【发布时间】：2022-11-18 02:55:47
【问题描述】：

我有 sql 查询，它将计算累计总和等。下面是查询

SELECT 
  GRP,  
  category, 
  price, 
  units, 
  CASE WHEN customers > 10 THEN customers ELSE 0 END AS customers_adj,
  1.00000 *(
    SUM(customers_adj) OVER(PARTITION BY grp, category ORDER BY 
        FIGURE DESC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
    ))/ SUM(customers_adj) OVER (PARTITION BY grp, category) AS cum_max_price_cust
FROM 
  table_1

问题出在最后一列。它作为 SQL 错误 [100051] [22012] 返回错误：除以零。谁能帮我这个？

【问题讨论】：

是否有 sum(customers_adj) OVER (partition by grp, category) = 0 的行？
1.00000 *( SUM(customers_adj) OVER(PARTITION BY grp, category ORDER BY FIGURE DESC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW )) 包含一些 0
那么当值为零时你希望发生什么？
只需在构造时创建一个案例： SELECT...CASE yourValueThatCouldBeZero WHEN 0 THEN valueIfItsZero ELSE something/yourValueThatCouldBeZero END...

标签： sql snowflake-cloud-data-platform mysql-error-1064 snowflake-schema

【解决方案1】：

您可以使用 DIV0。当除数为 0 时它返回 0（而不是报告错误）。

SELECT 
  GRP,  
  category, 
  price, 
  units, 
  CASE WHEN customers > 10 THEN customers ELSE 0 END AS customers_adj,
  1.00000 * DIV0( (
    SUM(customers_adj) OVER(PARTITION BY grp, category ORDER BY 
        FIGURE DESC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
    )), SUM(customers_adj) OVER (PARTITION BY grp, category) ) AS cum_max_price_cust
FROM 
  table_1;

https://docs.snowflake.com/en/sql-reference/functions/div0.html

【讨论】：

【解决方案2】：

你需要这个：

Select dividend / NULLIF(divisor, 0)

【讨论】：