Question

我遇到以下问题，并不断抛出“被零除”错误

以下是我正在使用的查询：

-1

我在“ 0_2_sales_count”和“ 2_4_sales_count”列中为不同的客户设置了零。任何人都可以建议我该如何处理以上错误。我尝试使用column = 0但仍然出现相同问题的情况。

我正在使用Amazon Redshift DB。

谢谢

Answer 1

您可以使用大小写检查“ 2_4_sales_count”中的0，并针对每种情况使用正确的代码

select cust_name,
      sum(case WHEN sale_date > CURRENT_TIMESTAMP-14 
          AND sale_date < CURRENT_TIMESTAMP then 1 else 0  END) AS "0_2_sales_count",
        sum(case WHEN sale_date > CURRENT_TIMESTAMP-28 
          AND sale_date < CURRENT_TIMESTAMP-14  then 1 else 0  END) AS "2_4_sales_count",
      ("0_2_sales_count") - ("2_4_sales_count") as "load_volume_diff_0_2_2_4",
      CASE WHEN "2_4_sales_count"::float = 0
          THEN 0 ELSE (("0_2_sales_count" - "2_4_weeks_load_volume")/"2_4_sales_count"::float) * 100  END as "load_volume_diff_percent_0_2_2_4"
from sales 
group by cust_name;

Answer 2

尝试使用“ 2_4_sales_count” :: float = 0然后1结尾的情况

select cust_name,
sum(case WHEN sale_date > CURRENT_TIMESTAMP-14 AND sale_date < CURRENT_TIMESTAMP then 1 else 0  END) AS "0_2_sales_count",
sum(case WHEN sale_date > CURRENT_TIMESTAMP-28 AND sale_date < CURRENT_TIMESTAMP-14  then 1 else 0  END) AS "2_4_sales_count",
("0_2_sales_count") - ("2_4_sales_count") as "load_volume_diff_0_2_2_4",
(("0_2_sales_count" - "2_4_weeks_load_volume")/case when "2_4_sales_count"::float =0 then 1 end) * 100  as "load_volume_diff_percent_0_2_2_4"
from sales 
group by cust_name;

Answer 3

大概是此行中的问题：

(("0_2_sales_count" -"2_4_weeks_load_volume") / "2_4_sales_count"::float) * 100  as "load_volume_diff_percent_0_2_2_4"

我会这样写：

(("0_2_sales_count" - "2_4_weeks_load_volume") * 100.0 / nullif("2_4_sales_count", 0.0) as "load_volume_diff_percent_0_2_2_4"

除以零的最简单解决方案是nullif()。

红移-除以零误差

3 个答案: