如何在不考虑时间的情况下按日期时间列进行分组

Question

我有一堆产品订单,我正在尝试按日期分组并总结该日期的数量.如何在不考虑时间的情况下按月/日/年进行分组？

3/8/2010 7:42:00 应该与...分组 3/8/2010 4:15:00

Answer 1

将值转换/转换Date为您的组的类型.

GROUP BY CAST(myDateTime AS DATE)

Answer 2

GROUP BY DATEADD(day, DATEDIFF(day, 0, MyDateTimeColumn), 0)

或者在SQL Server 2008之后,您可以简单地转换 Date 为@Oded建议:

GROUP BY CAST(orderDate AS DATE)

Answer 3

CAST 日期时间字段至今

select  CAST(datetime_field as DATE), count(*) as count from table group by CAST(datetime_field as DATE);

Answer 4

在pre Sql 2008中取出日期部分:

GROUP BY CONVERT(CHAR(8),DateTimeColumn,10)

Answer 5

GROUP BY DATE(date_time_column)