存储过程组按日期设置缺失日期的值

Question

在我的存储过程中，我返回按日期分组的总分钟数。日期范围是从昨天开始的一周。程序运行正常。但是，我面临的一个问题是。并不总是在7天之间会有特定日期的任何数据。

例如，如果我今天运行我的程序，它会返回此信息。

**Min  Date**
47  2014-08-03
153 2014-08-04
45  2014-08-05
166 2014-08-06

这位特殊的人在8月31日，8月1日和2日没有任何数据。因此，存储过程不会返回任何数据。

我想要做的是在数据库中没有记录的日子返回0。

**Min  Date**
0   2014-07-31
0   2014-08-01
0   2014-08-02
47  2014-08-03
153 2014-08-04
45  2014-08-05
166 2014-08-06

这是程序：

ALTER PROCEDURE [dbo].[getAgentChartData]
(
@ABID BIGINT
)

AS
BEGIN

SET NOCOUNT ON;

--RETURNING 7 DAYS WORTH OF DATA FROM YESTERDAY

DECLARE @TODAY AS DATE =GETDATE(),@WEEK AS DATE 

SET @WEEK =  DATEADD (DD, -8, @TODAY)

SELECT SUM(MINUTES) AS TOTALMINUTES, CONVERT(DATE, STARTDATE) AS DATE FROM PoLines 
    WHERE ADDRESSBOOKID = @ABID AND STARTDATE BETWEEN @WEEK  AND @TODAY
GROUP BY CONVERT(DATE, STARTDATE)


END

有什么建议吗？

编辑*

添加了霍根的建议。仍然遇到问题。

WITH Dates AS
(
SELECT DATEADD (DD, -7, GETDATE()) AS DAY
UNION ALL
SELECT DATEADD (DD, -6, GETDATE()) AS DAY
UNION ALL
SELECT DATEADD (DD, -5, GETDATE()) AS DAY
UNION ALL
SELECT DATEADD (DD, -4, GETDATE()) AS DAY
UNION ALL
SELECT DATEADD (DD, -3, GETDATE()) AS DAY
UNION ALL
SELECT DATEADD (DD, -2, GETDATE()) AS DAY
UNION ALL
SELECT DATEADD (DD, -1, GETDATE()) AS DAY
)
SELECT SUM(MINUTES) AS TOTALMINUTES, CONVERT(DATE, Dates.Day) AS DATE 
FROM Dates 
LEFT JOIN PoLines ON CONVERT(DATE, STARTDATE) = CONVERT(DATE, Dates.Day) 
WHERE ADDRESSBOOKID = @ABID 
GROUP BY CONVERT(DATE, Dates.Day)

Answer 1

在这样的小案例中，我只使用CTE制作内联表。像这样：

WITH Dates AS
(
   SELECT DATEADD (DD, -8, GETDATE()) AS DAY
 UNION ALL
   SELECT DATEADD (DD, -7, GETDATE()) AS DAY
 UNION ALL
   SELECT DATEADD (DD, -6, GETDATE()) AS DAY
 UNION ALL
   SELECT DATEADD (DD, -5, GETDATE()) AS DAY
 UNION ALL
   SELECT DATEADD (DD, -4, GETDATE()) AS DAY
 UNION ALL
   SELECT DATEADD (DD, -3, GETDATE()) AS DAY
 UNION ALL
   SELECT DATEADD (DD, -2, GETDATE()) AS DAY
 UNION ALL
   SELECT DATEADD (DD, -1, GETDATE()) AS DAY
)
SELECT SUM(ISNULL(MINUTES,0)) AS TOTALMINUTES, CONVERT(DATE, Dates.Day) AS DATE 
FROM Dates 
LEFT JOIN PoLines ON CONVERT(DATE, STARTDATE) = CONVERT(DATE, Dates.Day) 
  AND ADDRESSBOOKID = @ABID 
GROUP BY CONVERT(DATE, Dates.Day)

因为您将从Dates表中继续加入，所以您将获得Dates表的所有元素以及PoLines表的所有元素。然后group by将最多滚动7行。

您还可以在数据库中设置日期表以加入，并使用where子句限制日期范围（这是标准做法。）

注意，我现在无权访问数据库，所以我没有测试它可能有错字的SQL。