How Can I Efficiently Group Time Data by Hour or 10-Minute Intervals in SQL?

Detailed explanation of SQL time data grouping

In data analysis, processing time series data usually requires grouping by time in order to efficiently summarize and identify patterns. The GROUP BY clause in SQL can achieve this, but specifying the grouping granularity precisely is sometimes tricky.

Group by hour or 10 minute intervals

In MS SQL 2008, you can use the DATEPART function to group times by hours or 10-minute intervals. This function receives a date field as input and returns the specified part of that date. To group by hour, use:

<code class="language-sql">GROUP BY DATEPART(HOUR, [Date])</code>

Similarly, group by 10 minute intervals:

<code class="language-sql">GROUP BY (DATEPART(MINUTE, [Date]) / 10)</code>

Remove milliseconds from date output

In some cases it may be necessary to exclude milliseconds from the generated date/time output. To do this, you can use the following formula:

<code class="language-sql">DATEPART(YEAR, DT.[Date]) -- 年份
DATEPART(MONTH, DT.[Date]) -- 月份
DATEPART(DAY, DT.[Date]) -- 天
DATEPART(HOUR, DT.[Date]) -- 小时
(DATEPART(MINUTE, DT.[Date]) / 10) -- 10分钟间隔（无毫秒）</code>

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