select s.SalesID from SalesTbl s 
        where cast(cast(s.SaleDate  as date) as datetime) + cast(cast(s.SaleCreatedDate as time) as datetime) between @FromDate and @ToDate

将存储在datetime字段中的第一个日期转换为字符串，然后将存储在datetime字段中的时间转换为字符串，附加两个日期并转换回datetime字段，所有这些都使用已知的转换格式。

Convert(datetime, Convert(char(10), MYDATETIMEFIELD, 103) + ' ' + Convert(char(8), MYTIMEFIELD, 108), 103) 

将两个字段转换为DATETIME:

SELECT CAST(@DateField as DATETIME) + CAST(@TimeField AS DATETIME)

如果你正在使用Getdate()，首先使用这个:

DECLARE @FechaActual DATETIME = CONVERT(DATE, GETDATE());
SELECT CAST(@FechaActual as DATETIME) + CAST(@HoraInicioTurno AS DATETIME)

现有的答案不解决datetime2数据类型，所以我将添加我的:

假设你想添加一个时间值到datetime2值，其中:

datetime2值可以包含非零时间分量和/或小数秒 时间值可以包含值23:59:59.9999999，即86,399.9999999秒，86,399,999,999.9微秒或86,399,999,999,900纳秒¹

由于dateadd函数¹的限制，您必须分两步添加它们:

将时间值转换为秒并使用dateadd(second，…) 从时间值中提取纳秒，并使用dateadd(nanosecond，…)将它们添加到上面计算的日期中

declare @dv datetime2 = '2000-01-01 12:34:56.7890123';
declare @tv time = '23:59:59.9999999';
select dateadd(
    nanosecond,
    datepart(nanosecond, @tv),
    dateadd(
        second,
        datepart(hour, @tv) * 60 * 60 + datepart(minute, @tv) * 60 + datepart(second, @tv),
        @dv
    )
);
-- 2000-01-02 12:34:56.7890122

¹纳秒值可能不适合dateadd函数期望的int数据类型。

DECLARE @Dates table ([Date] datetime);
DECLARE @Times table ([Time] datetime);

INSERT INTO @Dates VALUES('2009-03-12 00:00:00.000');
INSERT INTO @Dates VALUES('2009-03-26 00:00:00.000');
INSERT INTO @Dates VALUES('2009-03-30 00:00:00.000');

INSERT INTO @Times VALUES('1899-12-30 12:30:00.000');
INSERT INTO @Times VALUES('1899-12-30 10:00:00.000');
INSERT INTO @Times VALUES('1899-12-30 10:00:00.000');

WITH Dates (ID, [Date])
AS (
    SELECT ROW_NUMBER() OVER (ORDER BY [Date]), [Date] FROM @Dates
), Times (ID, [Time])
AS (
    SELECT ROW_NUMBER() OVER (ORDER BY [Time]), [Time] FROM @Times
)
SELECT Dates.[Date] + Times.[Time] FROM Dates
    JOIN Times ON Times.ID = Dates.ID

打印:

2009-03-12 10:00:00.000
2009-03-26 10:00:00.000
2009-03-30 12:30:00.000

如果两个字段都是datetime，那么简单地添加它们就可以了。 例如: 声明@d datetime， @t datetime Set @d = '2009-03-12 00:00:00.000'; Set @t = ' 189-12-30 12:30:00.000'; 选择@d + @t 如果您使用Date & Time数据类型，则只需将时间转换为datetime 例如: 声明@d日期，@t时间 Set @d = '2009-03-12'; Set @t = '12:30:00.000'; 选择@d + cast(@t as datetime)