Query which shows FK child columns?

v9.6.16

I have a query which shows the parents and children in FK relations, along 
with the parent column name, but can't seem to find the child column names.

Is there a way to find the child column names without having to dig into 
pg_constraint?

Thanks

test=# select ccu.table_schema||'.'||ccu.table_name as parent_table,
test-#        ccu.column_name as parent_column,
test-#        tc.table_schema||'.'||tc.table_name as child_table,
test-# ccu.constraint_schema||'.'||ccu.constraint_name as con_name
test-# from information_schema.table_constraints tc,
test-#      information_schema.constraint_column_usage ccu
test-# where tc.constraint_type = 'FOREIGN KEY'
test-#   and tc.constraint_schema = ccu.constraint_schema
test-#   and tc.constraint_name = ccu.constraint_name
test-# order by parent_table, child_table, ccu.column_name
test-# ;
     parent_table     | parent_column | child_table     |              con_name
---------------------+---------------+---------------------+------------------------------------
  public.inventory    | inv_id        | public.sales_detail | 
public.sales_detail_sd_inv_id_fkey
  public.sales_header | parent_id     | public.sales_detail | 
public.sales_detail_id_fkey
(2 rows)

test=# \d inventory
              Table "public.inventory"
    Column    |          Type          | Modifiers
-------------+------------------------+-----------
  inv_id      | integer                | not null
  description | character varying(255) |
Indexes:
     "inventory_pkey" PRIMARY KEY, btree (inv_id)
Referenced by:
     TABLE "sales_detail" CONSTRAINT "sales_detail_sd_inv_id_fkey" FOREIGN 
KEY (sd_inv_id) REFERENCES inventory(inv_id)

test=# \d sales_header
    Table "public.sales_header"
   Column   |  Type   | Modifiers
-----------+---------+-----------
  parent_id | integer | not null
Indexes:
     "sales_header_pkey" PRIMARY KEY, btree (parent_id)
Referenced by:
     TABLE "sales_detail" CONSTRAINT "sales_detail_id_fkey" FOREIGN KEY 
(child_id) REFERENCES sales_header(parent_id)

test=# \d sales_detail
    Table "public.sales_detail"
   Column   |  Type   | Modifiers
-----------+---------+-----------
  child_id  | integer | not null
  seq       | integer | not null
  sd_inv_id | integer |
Indexes:
     "sales_detail_pkey" PRIMARY KEY, btree (child_id, seq)
Foreign-key constraints:
     "sales_detail_id_fkey" FOREIGN KEY (child_id) REFERENCES 
sales_header(parent_id)
     "sales_detail_sd_inv_id_fkey" FOREIGN KEY (sd_inv_id) REFERENCES 
inventory(inv_id)




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