Re: json select question

How can i pull a unique list of all json column names? such as book_name, catalog_name, etc

try json_object_keys() ... https://www.postgresql.org/docs/current/static/functions-json.html

but this will only pull the top level keys, like (from the first row of your example) , book_name, author... it won't pull out any second level fields like first_name, last_name.

you'll likely need to run this on all rows, and do a group by to get what you need.

thats a pretty messy way of storing data, btw, and not very relational, having a key name indicate a record type, and tossing all the record types into the same table.

-- 
john r pierce, recycling bits in santa cruz