没有用 0 值替换任何行

Question

我有以下查询

SELECT    DATEPART(YEAR, Date_Reported) AS 'Year',
          DATEPART(MONTH, Date_Reported) AS 'Month',
          DATEPART(DAY, Date_Reported) AS 'Day',
          COUNT(*) AS 'Transactions'
FROM TX
WHERE Date_Reported >= DATEADD(day,-7, GETDATE())
GROUP BY  DATEPART(DAY, Date_Reported),
          DATEPART(MONTH, Date_Reported),
          DATEPART(YEAR, Date_Reported)
ORDER BY  'Year',
          'Month',
          'Day'

它给我的是最近 7 天的交易，但是当一天的交易为 0 时，它不会显示一行。我想要的是没有行在事务列下显示为 0 值，如下所示：

YEAR | MONTH | DAY | TRANSACTIONS
2018 | 9     | 4   |     2
2018 | 9     | 5   |     2
2018 | 9     | 6   |     0
2018 | 9     | 7   |     5
2018 | 9     | 8   |     2
2018 | 9     | 9   |     0
2018 | 9     | 10  |     0

有什么想法吗？

Answer 1

这里是解决方案，

首先，您必须创建日期表作为基表，因为您在 TX 中没有一些日期记录，因为您显示为 0。 根据以下查询，您可以创建该表并将其存储到临时表中。

;WITH cte AS (
SELECT cast(GETDATE() as date) AS myDate
UNION ALL
SELECT cast( DATEADD(DAY,-1,myDate) as date)
FROM cte
where myDate >= DATEADD(day,-7, GETDATE())
)
SELECT myDate Into #dateTable
FROM cte

其次，您可以使用 Left Join #dateTable 和 Your TX，如下所示。

select DATEPART(YEAR, myDate) AS 'Year',
       DATEPART(MONTH, myDate) AS 'Month',
       DATEPART(DAY, myDate) AS 'Day',
       Count(Date_Reported) as 'Transactions'
from #dateTable
LEFT JOIN #Tempdata on CAST(Date_Reported as DATE) = CASt(myDate as date)
GROUP BY  DATEPART(DAY, myDate),
          DATEPART(MONTH, myDate),
          DATEPART(YEAR, myDate)
ORDER BY  'Year',
          'Month',
          'Day'

Answer 2

这是一种可能的解决方案：

WITH LastDays AS --Base table
(
  SELECT CAST(DATEADD(DAY,-D,SYSDATETIME()) AS Date) D FROM (VALUES (0),(1),(2),(3),(4),(5),(6)) T(D)
), TX AS --Demo data
(
  SELECT * FROM (VALUES
  (CAST(SYSDATETIME() AS Date)),
  (CAST(DATEADD(DAY,-2,SYSDATETIME()) AS Date))
  ) T(Date_Reported)
)
SELECT    DATEPART(YEAR, D) AS 'Year',
          DATEPART(MONTH, D) AS 'Month',
          DATEPART(DAY, D) AS 'Day',
          COUNT(Date_Reported) AS 'Transactions'
FROM LastDays
LEFT JOIN TX ON Date_Reported=D
GROUP BY  DATEPART(DAY, D),
          DATEPART(MONTH, D),
          DATEPART(YEAR, D)
ORDER BY  'Year',
          'Month',
          'Day'