- data a2;
- set a1;
- bool = (year=2008 | year=2009);
- run;
-
- proc sql;
- create table a3 as
- select stock from a2
- group by stock
- having count(bool)=2;
- run;
楼主: kuerxiaoxin
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850
3
[有偿编程] (小白求助)符合要求的公司必须保证至少2008前一年(2007)和后一年(2009)有年报 |
本科生 13%
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