plpgsql question

["Gauthier, Dave" <dave.gauthier@xxxxxxxxx>]

v8.3.4 on linux

 

Is there a way to set the query used in a "for rec in (query) loop -> end loop" be a variable?  Example

 

if (foo = 'whatever')

then

  sqlstmt := "select x,y,z ...";

else

  sqlstmt := "select a,b,c ...";

end if ;

 

for therec in

  sqlstmt

loop

    ...

end loop;

 

 

Thanks in Advance for any help.