How to put the results of a query into a variable?

I have written a Postgres anonymous block. In which I have written join query on multiple tables like:

select a.portal.*, a.p_fb_config.*, a.p_gplus_config  
from a.portal 
   left outer join a.p_fb_config on a.portal.pid = a.p_fb_config.pid 
   left outer join a.p_gplus_config on a.portal.pid = a.p_gplus_config.pid;

Now I want to catch this value in variable. So how should I declare that variable?

I need something like:

         portal_row a.portal%ROWTYPE;//for 3 tables