m*******r
发帖数: 10 | 1 95题中的第38题
38.Given the SAS data set WORK.ONE:
X Y Z
- - --
1 A 27
1 A 33
1 B 45
2 A 52
2 B 69
3 B 70
4 A 82
4 C 91
The following SAS program is submitted:
data WORK.TWO;
set WORK.ONE;
by X Y;
if First.Y;
run;
proc print data=WORK.TWO noobs;
run;
Which report is produced?
A.
X Y Z
-- -- --
1 B 45
2 A 52
2 B 69
3 B 70
4 A 82
4 C 91
B.
X Y Z
-- -- --
1 A 27
1 B 45
2 A 52
2 B 69
3 B 70
4 A 82
4 C 91
C.
X Y Z
-- -- --
1 A 33
1 B 45
2 A 52
2 B 69
3 B 70
4 A 82
4 C 91
D. The PRINT procedure fails because the data set WORK.TWO is not created in
the DATA step. | T******o
发帖数: 136 | 2 B.
first.y is 1 when a new value of y is scanned. also, whenever first.x is 1,
first.y will be 1. | i****w
发帖数: 329 | 3 work.one sort 过了吗？假如没sort过，work.two生成不了，因为by x y; statement
会报错。
【在 m*******r 的大作中提到】
: 95题中的第38题
: 38.Given the SAS data set WORK.ONE:
: X Y Z
: - - --
: 1 A 27
: 1 A 33
: 1 B 45
: 2 A 52
: 2 B 69
: 3 B 70
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