我定义了一个宏变量, 我想判断它的值是不是missing
有没有类似于missing() 函数的宏函数呢?
我试了
%let help =XXXXX;
%if %sysfunc(missing(&help)) %then %do;
Error输出:
ERROR: The function MISSING referenced by %SYSFUNC, %QSYSFUNC, or %SYSCALL cannot be used within
the MACRO function/call-routine interfaces.
ERROR: A character operand was found in the %EVAL function or %IF condition where a numeric
operand is required. The condition was: %sysfunc(missing(&help))