SQL 服务器 return 日期范围和指定值之间的关联值

Question

我正在使用如下查询从数据库中获取记录：

SELECT date as "Date", count(date) as "NumIssues"
FROM Issues
WHERE Date BETWEEN '2015-03-25' AND '2015-03-28'
GROUP BY date
ORDER BY date;

查询工作正常，但我需要它来获取结果，即使指定日期没有值并且 NumIssues 值 return 0。

解决这个问题的最好方法是放入 case 语句吗？提前致谢！

Answer 1

;WITH dates ( "Date" ) AS (
    SELECT  CONVERT( DATE, '2015-03-25' )
    UNION ALL
    SELECT  DATEADD( DAY, 1, Date )
    FROM    dates
    WHERE   DATEADD( DAY, 1, Date ) < '2015-03-28'
)
SELECT  d.Date
,       COUNT(date) as "NumIssues"
FROM    dates AS d
LEFT JOIN Issues AS i
    ON  i.date = d.Date
GROUP  BY d.date
ORDER  BY d.date;

SQL 服务器 return 日期范围和指定值之间的关联值

SQL Server return date range and associated value between specified values

sql

sql-server-2012