SQL Server 按时间间隔提取数据进行数据采样

Select Ana1,RdDate,RdTime,cast(convert(varchar,RdDate,112)+" "+convert(varchar,RdTime,108) as datetime) as time,t.interval FROM 
(SELECT Ana1,RdDate,RdTime, datediff (mi,cast(convert(varchar,RdDate,112)+" "+convert(varchar,RdTime,108) as datetime), GETDATE()) AS interval  
FROM Records ) AS t WHERE t.interval%10 = 0  //获得间隔十分钟的数据，但是获得以后分钟雷同的还会有反复，仍需进一步处置Select Ana1,RdDate,RdTime,cast(convert(varchar,RdD