sas base 123题中的第91 题
The following SAS program is submitted:
proc report data = work.houses nowd;
column style price;
where prices <100000;
<insert DEFINE statements here>
title;
run;
Exhibit: the output from the REPORT procedure.

Assume permanent variable labels have been assigned.
Which one of the following completes the program and produces the output
displayed in the exhibit?
A. define style / display width = 9;
define price / sum format = comma9. width = 10;
B. define style / width = 9;
define price / sum format = comma9. width = 10;
C. define style / group width = 9;
define price / sum format = comma9. width = 10;
D. define style / order width = 9;
define price / sum format = comma9. width = 10;

answer:D     why?

A后用display 为什么不可以?  sum group display across 的用法