proc mean统计freq遇到的问题

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一张表（几百万的数据）,我要统计不同合同号的数目，而我表中一个合同号可能出现几次，如果用proc mean统计的话，能不能实现？这只是我举的一个简单的例子。

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关键词：freq mean REQ Fre ROC 统计

Yes. But I still thank the proc freq is better. It is designed for it.

517  data t1;
518     do i=1 to 10;
519        n=ceil(ranuni(123)*10000000);
520        do j=1 to n;
521           output;
522        end;
523      end;
524      keep i;
525  run;

NOTE: The data set WORK.T1 has 42308340 observations and 1 variables.
NOTE: DATA statement used (Total process time):
      real time           2.48 seconds
      cpu time            2.02 seconds


526
527
528
529  proc means data=t1(keep=i) nway noprint;
530  class i;
531  output out=freq;
532  run;

NOTE: There were 42308340 observations read from the data set WORK.T1.
NOTE: The data set WORK.FREQ has 10 observations and 3 variables.
NOTE: PROCEDURE MEANS used (Total process time):
      real time           2.46 seconds
      cpu time            6.30 seconds


533
534  proc freq data=t1 noprint;
535  table i/out=freq2;
536  run;

NOTE: There were 42308340 observations read from the data set WORK.T1.
NOTE: The data set WORK.FREQ2 has 10 observations and 3 variables.
NOTE: PROCEDURE FREQ used (Total process time):
      real time           3.22 seconds
      cpu time            2.82 seconds