19.The SAS data set WORK.ONE contains a numeric variable named Num and a character variable named Char:
WORK.ONE
Num Char
--- ----
1 23
3 23
1 77
The following SAS program is submitted:
proc print data=WORK.ONE;
where Num='1';
run;
What is output?
A.
Num Char
--- ----
1 23
B.
Num Char
--- ----
1 23
1 77
C.
Num Char
--- ----
1 23
3 23
1 77
D. No output is generated.
Answer: D
难道不自动数值型转换成字符型?