But if you use multiple aggregations with the same grouping keys, or multiple counting functions that count the same column, it will not significantly increase the execution time of the rule.

但是，如果使用具有相同分组关键字的多个聚合，或者对相同列进行计数的计数函数，其不会显著增加规则的执行时间。

youdao

Note that if several counting functions or tests operate on the same column, then the sort and count operations only need to be done once.

注意，如果多个计数函数或测试在同一列上运行，那么排序与计数操作仅需做一次。

youdao

Altering a column must not make the total byte count of all columns exceed the maximum record size (SQLSTATE 54010).

对列的修改不能导致所有列的总字节数超过记录的最大大小(SQLSTATE 54010)。

youdao

But the column of those still waiting stretched, at last count, for 15km (nine miles).

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