Teradata 返回除以零错误 - 如何解决？

Question

下面的查询使用了带有一些划分的 case 语句。但是，它在除以零错误时遇到障碍。任何关于如何处理错误异常的想法将不胜感激！

CASE 
    WHEN Channel = 'DA' THEN  CAST (CASE_QTY AS DECIMAL(38,0))/SUM(CAST(CASE_QTY AS DECIMAL(38,2))) OVER (PARTITION BY ld.LOAD_ID) 
    WHEN Channel = 'SS' THEN  CAST (CASE_QTY AS DECIMAL(38,0))/SUM(CAST(CASE_QTY AS DECIMAL(38,2))) OVER (PARTITION BY ld.LOAD_ID) 
    WHEN Channel = 'XDOCK' THEN  CAST (CASE_QTY AS DECIMAL(38,0))/SUM(CAST(CASE_QTY AS DECIMAL(38,2))) OVER (PARTITION BY ld.LOAD_ID)
    WHEN Channel = '?' THEN  CAST (CASE_QTY AS DECIMAL(38,0))/SUM(CAST(CASE_QTY AS DECIMAL(38,2))) OVER (PARTITION BY ld.LOAD_ID) 
    ELSE 0
    END AS Percentage

Answer 1

你可以用另一个案例检查

  CASE  WHEN SUM(CAST(CASE_QTY AS DECIMAL(38,2)) <> 0 THEN
              WHEN Channel = 'DA' THEN  CAST (CASE_QTY AS DECIMAL(38,0))/SUM(CAST(CASE_QTY AS DECIMAL(38,2))) OVER (PARTITION BY ld.LOAD_ID)
        THEN -1 /*  or the value you prefer for zero value */
        END
   ....

Answer 2

只需使用NULLIF。此外，您可以将查询简化为：

CASE 
    WHEN Channel IN ('DA','SS','XDOCK','?') 
      THEN Cast(CASE_QTY AS DECIMAL(38,0))/NullIf(Sum(Cast(CASE_QTY AS DECIMAL(38,2))) Over (PARTITION BY ld.LOAD_ID),0) 
    ELSE 0
END AS Percentage

Teradata 返回除以零错误 - 如何解决？

Teradata returning Division by Zero Error - How to Adress?

sql

teradata

divide-by-zero