sas datasets过程(重要)

datasets相关选项的运用

proc datasets library =sashelp nolist;
    copy in=sashelp out=work;
    select air class vslib ac ets; *先于copy执行;

quit;

 proc datasets library=work nolist; delete class ets(mt=catalog); *1; 
copy in=work out=workme move memtype=data; *3;
 select air ac(mt=catalog); *2; 
quit;
 proc datasets library=work kill; *删除所有类型的文件;

quit;

*各种修改格式，索引，标签，等等;
proc datasets library=workme kill;
proc datasets library=sashelp nolist;
    copy in=sashelp out=workme;
    select class air;
proc datasets library=workme nolist;
    modify class(label='test subjects' read=green); (read对数据集进行加密，后面跟密码)
    index create idx=(name sex)/nomiss unique; (建立多变量索引);
    format height 6.2; (规定格式);
    label height='test height'; (规定标签);
    modify air;
    rename date=new_date;
quit;