Because they can be accessible by any sas program in the sas environment, these variables are referred to as global macro variables These methods include using global macro variables, conditional statements, and %sysfunc to execute data and proc steps within a macro The system time is an example of a global sas macro variable.
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Macro variables created within a macro function will be local unless they are already defined, in which case the original value will be modified you cannot assign a macro variable a value while explicitly defining it is global or local
/* variable one is declared local
Won't overwrite the global variable with the */ %let one = set in macro /* variable two is a global variable Is not declared local in this macro, the assignment
*/ %let two = set in macro; The default for macro variables created within a macro is local to the macro, however you can explicitly state the macro variable is global, and hence make it available outside. I don't think you can control the scope within proc sql You an use call symputx in a data step to specify the scope
However, macro variables created in open code, via proc sql, are global by default
Within a macro it will be local As noted in the comments you can also explicitly declare a macro variable as global using %global macro. However, the %global statement creates global macro variables that exist for the duration of the session or job The %local statement creates local macro variables that exist only during the execution of the macro that defines the variable.
You can create your own macro variables, change their values, and define their scope You can define a macro variable within a macro, and you can also specifically define it as a global variable, by defining it with the %global statement. This paper explores various methods that can be used to increase the flexibility of routine codes