查詢除以select語句時返回零

Question

當我嘗試將第一個嵌套的select語句除以一列的計數時，查詢將返回零。 當我將“ /”替換為“，”時，我收到兩個不同的數字，因此返回值不應為零。 這可能與數據集中的零有關嗎？ 任何幫助，將不勝感激

declare @hospitalfk int;
set @hospitalfk='1335'

declare @startdate date;
set @startdate='03/01/2014'

declare @enddate date;
set @enddate='02/28/2015'

declare @reportname varchar(50);
set @reportname='%Medicaid Billable Report%'

declare @metasectionname varchar(100);
set @metasectionname='Medicaid Primary'

select 
(
select count(iscoded)
from ope.ope.vwerali 
    where iscoded=1 
        and hospitalfk=@hospitalfk
        and reportdate between @startdate and @enddate
        and reportname like @reportname
        and metasectionname like @metasectionname
)
/count(iscoded)
from ope.ope.vwerali
    where hospitalfk=@hospitalfk
        and reportdate between @startdate and @enddate
        and reportname like @reportname
        and metasectionname like @metasectionname

Answer 1

不需要兩個選擇，只需使用Case語句進行計數即可。

此外，我認為你正試圖避免零0的除數。

同樣對於日期參數，將日期值作為ANSI Date傳遞，即YYYYMMDD

select count(CASE WHEN iscoded=1  THEN iscoded END) * 1.00
      / NULLIF(count(iscoded), 0) 
from ope.ope.vwerali 
    where  hospitalfk=@hospitalfk
        and reportdate between @startdate and @enddate
        and reportname like @reportname
        and metasectionname like @metasectionname

Answer 2

declare @hospitalfk int;
set @hospitalfk='1335'

declare @startdate date;
set @startdate='03/01/2014'

declare @enddate date;
set @enddate='02/28/2015'

declare @reportname varchar(50);
set @reportname='%Medicaid Billable Report%'

declare @metasectionname varchar(100);
set @metasectionname='Medicaid Primary'

select 
(
    select CONVERT(NUMERIC(10,2),count(iscoded))
    from ope.ope.vwerali 
    where iscoded=1 
        and hospitalfk=@hospitalfk
        and reportdate between @startdate and @enddate
        and reportname like @reportname
        and metasectionname like @metasectionname
)
/CONVERT(NUMERIC(10,2),count(iscoded))
from ope.ope.vwerali
    where hospitalfk=@hospitalfk
        and reportdate between @startdate and @enddate
        and reportname like @reportname
        and metasectionname like @metasectionname

Answer 3

我得到了它返回想要的期望值。 歸功於Kevin Suchlicki。 我要做的就是更改：

count(iscoded)

至

convert(float,nullif(count(iscoded),0))

更新查詢

declare @hospitalfk int;
set @hospitalfk='1335'

declare @startdate date;
set @startdate='03/01/2014'

declare @enddate date;
set @enddate='02/28/2015'

declare @reportname varchar(50);
set @reportname='%Medicaid Billable Report%'

declare @metasectionname varchar(100);
set @metasectionname='Medicaid Primary'

select 
(
select convert(float,nullif(count(iscoded),0))
from ope.ope.vwerali 
    where iscoded=1 and hospitalfk=@hospitalfk
        and reportdate between @startdate and @enddate
        and reportname like @reportname
        and metasectionname like @metasectionname
)
/convert(float,nullif(count(iscoded),0))
from ope.ope.vwerali
    where hospitalfk=@hospitalfk
        and reportdate between @startdate and @enddate
        and reportname like @reportname
        and metasectionname like @metasectionname