how to take database dump in postgresql code example

Example 1: postgres make sql dump

pg_dump -U username dbname > dbexport.pgsql

Example 2: how to take database dump in postgresql

pg_dump dbname > outfile

Example 3: postgresql dump and restore db

#To dump a database called mydb into a SQL-script file:
pg_dump mydb > db.sql

#To reload such a script into a (freshly created) database named newdb:
psql -d newdb -f db.sql

Example 4: psql load dump

psql databasename < data_base_dump