可以写sql来完成

谢谢

能说的更详细些么？这样无从下手啊。

/* 1. create the week variable */
data test_1;
    set test;
 Tweek = week(tdate);
 Tyear = year(tdate);
run;

/* 2. sort the dataset by year and week */
proc sort data=test_1 out=test_2;
 by Tyear Tweek;
run;

/* 3. find the first and last records of each week */
data test_3;
    set test_2;
 by Tyear Tweek;
 if first.Tweek or last.Tweek then output;
run;