Notice that TIMEID is not one of the grouping columns of the outer select.
注意，TIMEID不是外层选择的分组列之一。
While the ordering of the grouping columns does not matter for a single grouping set or multiple grouping sets, the order of the columns does matter for ROLLUP.
对于单一分组集或多个分组集，分组列的次序是无所谓的；但是对于ROLLUP，列的次序不能随意安排。
If a rule must contain one aggregation, then you can compute additional aggregations on different columns in the same rule without impacting performance, as long as the grouping keys are the same.
如果规则必须包含一个聚合，那么可以在同一规则中，对不同列计算附加聚合，只要分组关键字相同，就不会影响性能。
The relevant factor that impacts the complexity of the job is the number of different grouping keys, not the number of different aggregated columns that you would see in counting functions.
影响任务复杂性的相关要素是不同分组关键字的数量，而不是在计数函数中所看到的，不同的所聚合列的数量。
Frequently, if calculated columns are used, the calculation reflects grouping of columns with the "group BY" modifier.
如果使用计算过的列，计算往往反映使用“GROUPBY ”修饰符对列所进行的分组。
Layout information can contain the columns you want to place in the grid, as well as additional information such as formatting information, column grouping, column width, and so on.
布局信息包括想要放置在网格中的列，还有一些附加信息，如格式信息、列分组、列宽等等。
Layout information can contain the columns you want to place in the grid, as well as additional information such as formatting information, column grouping, column width, and so on.
布局信息包括想要放置在网格中的列，还有一些附加信息，如格式信息、列分组、列宽等等。
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