SAS advanece50题 第26题答疑

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26. The following SAS program is submitted:
%let mvar=bye;
data _null_;
var1='hi';
var2='hello';
call symput('var1' || "&mvar", var2);
run;
Which one of the following is the name of the macro variable created by the CALL SYMPUT
statement?
Correct answer: c
a. var1
b. hibye
c. var1bye
d. No macro variable is created because the CALL SYMPUT
statement is not valid.
Your answer:
The CALL SYMPUT statement in this example uses the concatenation operator to join the text
string var1 with the resolved value of the macro variable reference &mvar, which is bye.
Therefore, the name of the new macro variable is var1bye.
此题选C不选B的原因在于，"var1"是用引号quote了的，带了引号的话SAS就认为其是个字符串而不是变量，因此不会resovlve 为 hi .var1带引号就是字符串，一个具体的值，不带则是一个变量，一个变量name.


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关键词：advan Vane NEC Van statement following because created example hello

补充知识点1： SQL中，insert into 和 undate是针对rows的，前者添加新的rows, 后者修改已有的rows;
                                alter是针对colomn的，可以修改，增加，删除colomn, modify为其选择项

补充知识点2;MLOGIC option trace macro execution activity including the beginning of macro execution and the evaluation of % IF ;
                  MPRINT option specifies that text that is sent to the compiler as a result of macro execution is printed in SAS log.