Question

为什么我无法在0或星期日（周日没有发生交易）时在列中获得值@processdate date = null

这是我的原始查询，只有当@processdate被声明为星期一的非星期日或null时才会给我表中的值当@processdate= null或任何星期日

时，我需要它在表格中显示0

alter procedure USP_CTG_VolumeReport   
    @processdate date = '1/8/2017'
as

declare @date date = coalesce(@processdate, cast( getdate() as date)) 

select    'apa' as  Source,
           cast(AccountID_AssignDT as date)as 'Date',
           count(*) as Total_Count
from apa_2000
where
    cast(AccountID_AssignDT as date) = @date 
group by
    cast(AccountID_AssignDT as date)

我应该能够使用子查询获得正确的表但由于某种原因 - 它不起作用下面是我的子查询，它给出了与我之前的查询相同的结果

select   
    'apa' as Source,
    cast(AccountID_AssignDT as date)as 'Date',
    isnull((select count(*) 
            from apa_2000
            where cast(AccountID_AssignDT as date) = @date) 
           , 0 ) as Total_Count
from apa_2000
where
    cast(AccountID_AssignDT as date) = @date 
group by
    cast(AccountID_AssignDT as date)

Answer 1

这里的问题是没有处理的日期，因此计数将为零，数据库中根本就不存在。您期望查询生成不存在的数据。您需要的是一张表格，其中包含您要报告的所有日期的列表，然后根据这些日期匹配计数。

如果您总是在一个日期内传递，则以下情况可行，因为输入日期是您需要的唯一日期：

declare @date as date = '20170416'

select
    'apa' as Source,
    @date as 'Date',
    count(apa_2000.AccountID_AssignDT) as Total_Count
from
    (select 1 as x)x
    LEFT OUTER JOIN
    apa_2000 ON cast(AccountID_AssignDT as date) = @date

列值未显示

1 个答案: