Question

我正在使用如下查询从数据库中提取记录：

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，但即使没有指定日期的值，我也需要它来获取结果，并为NumIssues值返回0。

最好的解决方法是提出案例陈述吗？提前谢谢！

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 Server返回日期范围和指定值之间的关联值

1 个答案: