text: 
  select count(*)
  from admin_bdys_202205.abs_2021_sa2;
  
  
  select *
  from gnaf_202205.boundary_concordance
  where from_bdy = 'postcode'
  and to_bdy = 'poa';
  
  
  select *
  from admin_bdys_202205.abs_2016_sa1;
  
  
  
  
  -- test getting centroids for bdy overlaps
  select *,
         st_centroid(st_intersection(from_bdy.geom, to_bdy.geom)) as geom
  from census_2016_bdys.sa2_2016_aust as from_bdy
           inner join census_2016_bdys.lga_2016_aust as to_bdy on st_intersects(from_bdy.geom, to_bdy.geom)
  ;
  
  
  
  select *
  from gnaf_202205;