XML 不会输出 SQL 查询中遇到的除以零

Question

我有一个选择选举数据的查询。当然，当您开始选举时，所有候选人都有 0 票输入。但逐渐地，投票进入。为了从结果中获得输出百分比，我将选票数乘以 100，然后除以总票数，得到我的百分比。

问题- 一旦我的查询针对 xml 路径运行，xml 文档的第一行中就会出现一个错误，“遇到除零错误”。为了绕过这个，我只是注释掉了分界线，但我不想这样做。我想，如果我等到有一场比赛在每个领域都有投票，然后我会取消注释那行代码并让它输出只有那场比赛的百分比......直到所有比赛都至少有一些投票在他们里面。

这是我的sql代码：

:XML ON
select 
    max(case when seqnum = 1 then title1 end) as title1,
    max(case when seqnum = 1 then [precinct percent] end) as PrecinctPercent,
    max(case when seqnum = 1 then [candidate num] end) as WinnerNum,
    max(case when seqnum = 1 then Votes end) as WinningVotes,
    max(case when seqnum = 1 then party end) as WinningParty,
    max(case when seqnum = 1 then leader end) as Winner,
    max(case when seqnum = 1 then CAST(winner AS tinyint) end) as WinnerSelected,
    max(case when seqnum = 1 then ((Votes * 100) / ([total vote])) end) as WinnerPercent,
    max(case when seqnum = 2 then [candidate num] end) as LoserNum,
    max(case when seqnum = 2 then Votes end) as LosingVotes,
    max(case when seqnum = 2 then party end) as LosingParty,
    max(case when seqnum = 2 then leader2 end) as Loser,
    max(case when seqnum = 2 then ((Votes * 100) / ([total vote])) end) as LoserPercent,
    max(case when seqnum = 2 then CAST(winner AS tinyint) end) as LoserSelected,
    max(case when seqnum = 3 then title1 end) as title1,
    max(case when seqnum = 3 then [precinct percent] end) as PrecinctPercent,
    max(case when seqnum = 3 then [candidate num] end) as WinnerNum,
    max(case when seqnum = 3 then Votes end) as WinningVotes,
    max(case when seqnum = 3 then ((Votes * 100) / ([total vote])) end) as WinnerPercent,
    max(case when seqnum = 3 then party end) as WinningParty,
    max(case when seqnum = 3 then [first name]+ ' ' + [last name] end) as Winner,
    max(case when seqnum = 3 then CAST(winner AS tinyint) end) as WinnerSelected,
    max(case when seqnum = 4 then [precinct percent] end) as PrecinctPercent,
    max(case when seqnum = 4 then [candidate num] end) as LoserNum,
    max(case when seqnum = 4 then Votes end) as LosingVotes,
    max(case when seqnum = 4 then ((Votes * 100) / ([total vote])) end) as LoserPercent,
    max(case when seqnum = 4 then party end) as LosingParty,
    max(case when seqnum = 4 then [first name]+ ' ' + [last name] end) as Loser,
    max(case when seqnum = 4 then CAST(winner AS tinyint) end) as LoserSelected




from 
(
select  
        r.title1,
        r.[precinct percent],
        r.[total vote],
        rc.[race number],
        rc.[candidate num],
        rc.[Votes],
        rc.[winner],
        c.[party],
        r.[leader],
        r.[leader percent],
        r.[leader2],
        r.[leader2 percent],
        c.[first name],
        c.[last name],


            row_number() over (partition by rc.[race number] order by votes desc) as seqnum
    from    dbo.[RACE CANDIDATES] rc
    inner join dbo.[CANDIDATE] c    on  rc.[candidate num]  = c.[candidate number]
    inner join dbo.[RACE] r
     on rc.[race number] = r.[race number] 

) rc
group by rc.[race number]
FOR XML PATH ('ELECTION'), ROOT('root')

有没有一种方法可以让选择语句“忽略”任何包含 0 的字段。或者选择忽略那些确实包含 0 票的字段。

如果有帮助，将从表“[RACE CANDIDATES]”中选择总票数。希望一切都有意义。

任何意见将不胜感激。

谢谢大家！

Answer 1

您可以在子选择中放入 where

WHERE r.[total vote] != 0

或者你可以使用案例陈述

CASE WHEN r.[total vote] =  0 THEN 0 ELSE Votes / r.[total vote] END