Filter for two variable in macros

[BrahmanandaRao]

%macro t1(a,b,c);
data &a;
set &a	;
where Type eq (&c and Origin &c);
run;
%mend t1;

%t1(dsn,sashelp.cars,	'Sedan' & 'Asia');

why error please advise me 

[Kurt_Bremser · Accepted solution]

Rule #1 of macro development: start with working SAS code.

By manually resolving your macro parameters, I get this code:

data dsn;
set dsn;
where Type eq ('Sedan' & 'Asia' and Origin 'Sedan' & 'Asia');
run;

The where condition is very obviously invalid syntax. Fix that in the data step code, and then start to make it dynamic by proper use of macro variables.

[PaigeMiller]

Agreeing with @Kurt_Bremser , you have to create working SAS code without macro variables first. If your code doesn't work properly without macro variables, then it will not work properly with macro variables.

Also, you rarely need to have the values of macro variables enclosed in quotes.