SQL 查询列出最近 7 天的记录

Question

我需要查询列出该日期的所有记录，如果记录不存在则查询应列出 0

SELECT  Count(C.ConversionStatusID) Visits, CONVERT(VARCHAR(10),ActionDate,110) ActionDate
FROM Conversion C
WHERE C.ConversionStatusID = 2 AND 
      ActionDate Between DateAdd(day,-7,GetDate()) AND GETDATE()
GROUP BY CONVERT(VARCHAR(10),ActionDate,110) 
Order BY CONVERT(VARCHAR(10),ActionDate,110) DESC

预期输出应始终为 7 条记录，示例结果应如下所示

  ActionDate    Visits
  01-09-2015    1
  01-08-2015    5
  01-07-2015    0
  01-06-2015    0
  01-05-2015    3
  01-04-2015    8
  01-03-2015    0

提前致谢

Answer 1

您需要有过去 7 天的日期 table，然后您可以 left join

with cte (value, n)
as
(
  select DATEADD(DAY, DATEDIFF(day,0,getdate()),0) as value,1 as n
  UNION ALL
  SELECT DATEADD(day, -1, value) as value, n+1
  from cte
  where n < 7
)
select CONVERT(VARCHAR(10),cte.value,110) as ActionDate ,  Count(C.ConversionStatusID) Visits
from cte
left join Conversion C
ON CONVERT(VARCHAR(10),C.ActionDate,110) = CONVERT(VARCHAR(10),cte.value,110)
and  C.ConversionStatusID = 2
GROUP BY CONVERT(VARCHAR(10),cte.value,110) 
Order BY CONVERT(VARCHAR(10),cte.value,110) DESC

Answer 2

像这样的东西会起作用，但你将不得不考虑什么应该是日期，什么应该是日期时间。根本不清楚您需要时间组件的时间和地点。特别是，您的 WHERE 子句似乎与您的其余查询相矛盾，因为它没有占用时间。例如，如果 GETDATE() 是 1 月 12 日下午 2 点，那么 1 月 11 日下午 1 点是前一天还是前两天？那么，1 月 5 日下午 1 点怎么样，因为 WHERE 子句正在剥离它。

如果日期是 00:00 到 23:59（尽管 WHERE 子句仍然关闭）：

;WITH Dates ([Date]) AS (
    SELECT CAST(DATEADD(DAY,-1,GETDATE()) AS DATE) UNION
    SELECT CAST(DATEADD(DAY,-2,GETDATE()) AS DATE) UNION
    SELECT CAST(DATEADD(DAY,-3,GETDATE()) AS DATE) UNION
    SELECT CAST(DATEADD(DAY,-4,GETDATE()) AS DATE) UNION
    SELECT CAST(DATEADD(DAY,-5,GETDATE()) AS DATE) UNION
    SELECT CAST(DATEADD(DAY,-6,GETDATE()) AS DATE) UNION
    SELECT CAST(DATEADD(DAY,-7,GETDATE()) AS DATE))
SELECT  D.Date,
    COALESCE(Count(C.ConversionStatusID),0) Visits
FROM Dates D
LEFT JOIN Conversion C
    ON D.[Date] = CAST(C.ActionDate AS Date)
WHERE C.ConversionStatusID = 2 AND 
      ActionDate Between DateAdd(day,-7,GetDate()) AND GETDATE()
GROUP BY CONVERT(VARCHAR(10),ActionDate,110) 
Order BY CONVERT(VARCHAR(10),ActionDate,110) DESC

如果您有 Numbers 或 tally table，您可以不使用 CTE 而逃脱惩罚 table，但对于这么小的东西，它真的没有那么重要。

SQL 查询列出最近 7 天的记录

SQL Query to list records for last 7 days

sql

sql-server

select