1)data is below prototype=# select jsonb_pretty(memo) from foo prototype-# where id = 1; jsonb_pretty --------------------------- { + "name": "japan", + "currency": "JPY", + "population": "10000"+ } (1 row) 2)if you use copy to stdout, psq…

only using sql and sql-command0)main table to store binary file belowprototype=# \d storedpdf Table "public.storedpdf" col name type description id integer key name character varying file name pdf bytea to store files 1)create temporary ta…