count函数非常有用，可以在任何级别显示汇总表中的每个汇总行由多少条记录组成。
The COUNT function is very useful to show at any level how many records make up each aggregated row in the summary table.
count函数非常有用，可以在任何级别显示汇总表中的每个汇总行由多少条记录组成。
The COUNT function is very useful to show at any level how many records make up each aggregated row in the summary table.
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