避免使用 OVER 子句除以零

Question

我有看法：

create view AA(
    select 
    ba.[FYear],right(ba.[FPeriodId],2) Month,am.[L1],am.L2,ba.[SS],ba.[SM],

    sum(ba.[TSB]) OVER (PARTITION BY right(ba.[FPeriodId],2),ba.[SS]) as 'X',
    ba.[TSB]/sum(ba.[TSB]) OVER (PARTITION BY right(ba.[FPeriodId],2),ba.[SS]) as 'Y'

    from [table1] ba left join [b1_map] am on ba.[SS1] = am.[SS1])

我想避免被零除，所以我使用 ISNULL：isnull(ba.[TSB]/sum(ba.[TSB]))。

现在当我运行查询时：select * from AA 我收到消息：

"The function 'ISNULL' is not a valid windowing function, and cannot be used with the OVER clause."

我该如何解决这个问题？

Answer 1

使用NULLIF()避免被零除：

(ba.[TSB] /
 NULLIF(sum(ba.[TSB]) OVER (PARTITION BY right(ba.[FPeriodId],2), ba.[SS]), 0)
) as Y

此外，我不鼓励您对列别名使用单引号。有一天，当您引用列时，您将使用它们，引入一个难以调试的错误。仅对字符串和日期常量使用单引号。

避免使用 OVER 子句除以零

Avoid divide by zero with the OVER clause

sql

divide-by-zero

sql-server-2008

divide

window-functions