求助：SAS advanced 63里面一道题 [推广有奖]

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hailingkatherin 发表于 2015-6-26 17:26:05 |AI写论文

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Item 4
Given the SAS data set SASUSER.HIGHWAY:
Steering Seatbelt Speed Status Count
-------- -------- ----- ------- -----
absent No 0-29 serious 31
absent No 0-29 not 1419
absent No 30-49 serious 191
absent no 30-49 not 2004
absent no 50+ serious 216
The following SAS program is submitted:
proc sql noprint;
select distinct Speed [_insert_SQL_clause_]
from SASUSER.HIGHWAY
;
quit;
title1 “Speed values represented are: &GROUPS”;
proc print data=SASUSER.HIGHWAY;
run;
Which SQL clause stores the text 0-29,30-49,50+ in the macro variable GROUPS?
A. into &GROUPS
B. into :GROUPS
C. into :GROUPS separated by ‘,'
D. into &GROUPS separated by ‘,’
C对想问下为什么不能选B？
谢谢！