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如何只比较SQL Server 2005中DateTime数据类型的时间部分？例如,我想获取MyDateField在特定时间之后的所有记录.以下示例是一个非常长且可能不快的方法.我想要MyDateField大于12:30:50.400的所有日期

SELECT *
FROM   Table1
WHERE      ((DATEPART(hour, MyDateField) = 12) AND (DATEPART(minute, MyDateField) = 30) AND (DATEPART(second, MyDateField) = 50) AND (DATEPART(millisecond, MyDateField) > 400))
        OR ((DATEPART(hour, MyDateField) = 12) AND (DATEPART(minute, MyDateField) = 30) AND (DATEPART(second, MyDateField) > 50))
        OR ((DATEPART(hour, MyDateField) = 12) AND (DATEPART(minute, MyDateField) > 30))
        OR ((DATEPART(hour, MyDateField) > 12))