我很难尝试迭代宏%do循环中的值列表。每个值都应该用作变量后缀。
该方法基于SAS文档:http://support.sas.com/kb/26/155.html
(简化)代码是:
%macro loop(values);
%let count=%sysfunc(countw(&values));
%do i = 1 %to &count;
%let value=%qscan(values,i,%str(,));
proc sql;
select count(distinct hut_id) as prefix_&value.
from saslib.tl1_results_eval
group by plan_cell;
quit;
%end;
%mend;
%loop(%str(a,b,c,d))
生成的错误消息为:
MLOGIC(LOOP): %DO loop beginning; index variable I; start value is 1; stop value is 4; by value
is 1.
MLOGIC(LOOP): %LET (variable name is VALUE)
MPRINT(LOOP): proc sql;
22: LINE and COLUMN cannot be determined.
NOTE 242-205: NOSPOOL is on. Rerunning with OPTION SPOOL might allow recovery of the LINE and
COLUMN where the error has occurred.
ERROR 22-322: Syntax error, expecting one of the following: ',', AS.
MPRINT(LOOP): select count(distinct hut_id) as prefix_a from group by plan_cell;
MPRINT(LOOP): quit;
有趣的是,如果我删除"前缀_"从" count(distinct hut_id)作为prefix_& value。" - 它的工作非常好。不幸的是,我确实需要前缀。另外,正如您在日志消息中看到的那样,PROC SQL语句最终会被正确编译,但代码在执行之前会出错。
有什么想法在这里发生了什么?谢谢!
答案 0 :(得分:1)
由于qscan功能,您正在插入不可见的引号字符。尝试:
%macro loop(values);
proc sql;
%let count=%sysfunc(countw(&values));
%do i = 1 %to &count;
%let value=%qscan(values,i,%str(,));
select count(distinct hut_id) as prefix_%unquote(&value)
from saslib.tl1_results_eval
group by plan_cell;
%end;
quit;
%mend;
%loop(%str(a,b,c,d))
请注意proc sql;
声明的移动 - 几乎没有充分的理由退出;并在每个SQL语句之间重新实例化SQL过程,这会产生开销..