sql-server-2008 - T-SQL计算平均时间

Question

我在计算平均时间时遇到问题。
就是这种情况：
我有多行，每行中都有时间格式的数据
所以我需要计算所有行的平均时间，并将其与行数相乘，但是数据格式当然存在问题，因为我需要将时间与整数相乘

有人可以帮我一些建议吗？
n
这是一些数据：

times
00:00:00.7400000
00:00:01.1870000
00:00:00.6430000
00:00:00.6100000
00:00:12.9570000
00:00:01.1000000
00:00:00.7400000
00:00:00.5300000
00:00:00.6330000
00:00:01.6000000
00:00:02.6200000
00:00:01.0300000
00:00:01.9630000
00:00:00.9800000
00:00:01.0170000
00:00:00.7600000
00:00:00.7130000
00:00:00.9730000
00:00:01.0000000
00:00:01.0530000
00:00:02.9400000
00:00:00.8200000
00:00:00.8400000
00:00:01.1800000
00:01:25.8230000
00:00:01.0000000
00:00:00.9700000
00:00:01.2930000
00:00:01.3270000
00:00:13.5570000
00:00:19.3170000
00:00:58.2730000
00:00:01.6870000
00:00:18.7570000
00:00:42.8570000
00:01:12.3770000
00:00:01.2170000
00:00:09.9470000
00:00:01.4730000
00:00:00.9030000
00:00:01.0070000
00:00:01.1100000
00:00:01.6270000
00:00:05.0570000
00:00:00.6570000
00:00:00.7900000
00:00:03.2930000
00:00:00.8600000
00:00:01.0330000
00:00:00.9300000
00:00:00.8730000
00:00:00.9600000
00:00:00.8070000
NULL

因此，根据此数据，需要平均时间或/和该数据的总和

Answer 1

您应该能够使用类似于以下内容的东西：

select 
  cast(cast(avg(cast(CAST(times as datetime) as float)) as datetime) as time) AvgTime,
  cast(cast(sum(cast(CAST(times as datetime) as float)) as datetime) as time) TotalTime
from yourtable;

请参见SQL Fiddle with Demo。

这样会将times数据转换为datetime，然后转换为float，以便获得avg / sum，然后将值转换回datetime，最后转换为time