Question

我有以下sql查询，它以Month格式返回DateTime格式的信息，如12月或Novermber：

SELECT     COUNT(DISTINCT dbo.UserQuiz.QuizID) AS [Total Number of Taken Quizzes], dbo.Divisions.DivisionName, DATENAME(Month, dbo.UserQuiz.DateTimeComplete) 
                      AS Month
FROM         dbo.UserQuiz INNER JOIN
                      dbo.Quiz ON dbo.UserQuiz.QuizID = dbo.Quiz.QuizID INNER JOIN
                      dbo.employee ON dbo.UserQuiz.Username = dbo.employee.Username INNER JOIN
                      dbo.Divisions ON dbo.employee.DivisionCode = dbo.Divisions.SapCode
GROUP BY dbo.Divisions.DivisionName, DATENAME(Month, dbo.UserQuiz.DateTimeComplete)

我想以任何格式获取日期，例如：mm-dd-yyyy。怎么做？

Answer 1

select cast(convert(varchar, datefield, 112) as datetime)

这用于返回datetime，如果你想要一个字符串 - 只用正确的格式编号转换而不是112

对于服务器版本2008+，您可以在GROUP BY子句构造中使用更简单快速的方法，如

CAST(dbo.UserQuiz.DateTimeComplete as DATE)

Answer 2

SELECT     COUNT(DISTINCT dbo.UserQuiz.QuizID) AS [Total Number of Taken Quizzes], dbo.Divisions.DivisionName, convert(varchar,dbo.UserQuiz.DateTimeComplete,110 ) 
                      AS Month
FROM         dbo.UserQuiz INNER JOIN
                      dbo.Quiz ON dbo.UserQuiz.QuizID = dbo.Quiz.QuizID INNER JOIN
                      dbo.employee ON dbo.UserQuiz.Username = dbo.employee.Username INNER JOIN
                      dbo.Divisions ON dbo.employee.DivisionCode = dbo.Divisions.SapCode
GROUP BY dbo.Divisions.DivisionName,convert(varchar,dbo.UserQuiz.DateTimeComplete,110)

Answer 3

我可能只将日期作为日期时间值返回，并将格式化作业保留给客户端应用程序。您可以重置日期时间的时间和日期部分，如下所示：

DATEADD(MONTH, DATEDIFF(MONTH, 0, your_datetime_value), 0)

上述表达式返回相应月份的第一个月的午夜，例如对于2011-12-26 16:49:53.487，它会产生2011-12-01 00:00:00.000。

如何从sqlserver中的DateTime信息中只获取日期？

3 个答案: