gistfile1.txt

cramdb=# select d->'isbn_10' from bub where d ? 'isbn_10' limit 5;
           ?column?
------------------------------
 ["0521641985", "0521645719"]
 ["039455583X"]
 ["0738706884"]
 ["1603200495"]
 ["0665890753"]
(20 rows)

so I would want:

 "0521641985"
 "0521645719"
 "039455583X"
 "0738706884"
 "1603200495"
 "0665890753"
 
 
 BUT this does this:
cramdb=# select json_array_elements(d->'isbn_10') from bub where d ? 'isbn_10' limit 5;
ERROR:  function json_array_elements(jsonb) does not exist
LINE 1: select json_array_elements(d->'isbn_10') from bub where d ? ...
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.