Question

我试图每小时从大型SQL DB中提取数据。以下查询给我一个分钟分组。我希望按小时分组数据。

select CONVERT(VARCHAR(20), t.counterTime, 100) as [Time],
    t.instanceName
from table as t
WHERE t.counterId= @counterId
and t.counterTime >=  @startTime
and t.counterTime <  @endTime
group by t.instanceName, CONVERT(VARCHAR(20), t.counterTime, 100)

documentation也没有提供任何此类选项。有任何想法吗？

Answer 1

试试这个，

--SQL Server 2012
SELECT FORMAT(t.counterTime, 'yyyy-MM-dd HH') AS [Time]
    ,t.instanceName
FROM TABLE AS t
WHERE t.counterId = @counterId
    AND t.counterTime >= @startTime
    AND t.counterTime < @endTime
GROUP BY t.instanceName
    ,FORMAT(t.counterTime, 'yyyy-MM-dd HH')

--for earlier versions
SELECT CONVERT(CHAR(13), t.counterTime, 120) AS [Time]
    ,t.instanceName
FROM TABLE AS t
WHERE t.counterId = @counterId
    AND t.counterTime >= @startTime
    AND t.counterTime < @endTime
GROUP BY t.instanceName
    ,CONVERT(CHAR(13), t.counterTime, 120)

Note: Format would be perfoming slower.

Answer 2

您可以像这样使用子字符串：

select substring(field,1,4) + '-'+ substring(field,6,2) +'-'+ substring(field,7,2)+' '+ substring(field,9,2)  from dbo.youtable

Answer 3

试试这个

select datepart(hour,t.counterTime) as [Time],
    t.instanceName
from table as t
WHERE t.counterId= @counterId
and t.counterTime >=  @startTime
and t.counterTime <  @endTime
group by t.instanceName, datepart(hour,t.counterTime)

CONVERT从{yyyy-mm-dd hh：mm：ss}到{yyyy-mm-dd hh}的时间

3 个答案: