To delete SAS macro variables, you can use the %SYMDEL statement or the CALL SYMDEL routine.
%SYMDEL and CALL SYMDEL is a data step call routine that is used to delete macro variables from the global symbol table.
How to Delete a single macro variable?
You can use both methods to delete a macro variable.
Delete a macro variable with the CALL SYMDEL Routine
To delete a macro variable using the CALL SYMDEL, use the macro variable name within quotes in the Call routine.
CALL SYMDEL(macro-variable<, option>);
%let mvar = xyz; data _null_; call symdel('mvar'); run;
Note that CALL SYMDEL issues a warning when an attempt is made to delete a non-existent macro variable. To suppress this message, use the NOWARN option.
Delete a macro variable with the %SYMDEL Macro Statement
The %SYMDEL routine deletes the specified variable from the macro global symbol table.
%SYMDEL variable-name ;
%SYMDEL statement gives a warning when an attempt is made to delete a non-existent macro variable. To suppress this warning in the log, you can use the NOWARN option.
%symdel variable-name / nowarn;
%let mname = ABC; %put &mname; %symdel mname; %put &mname
So, this is the way you can delete macro variables in SAS. We really hope that you must have found it useful.
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