insert into with select postgres code example

Example 1: return insert results in POSTGRESQL

# to select specific columns
INSERT INTO users (firstname, lastname) VALUES ('Joe', 'Cool') RETURNING id, firstname;
# to return every column
INSERT INTO users (firstname, lastname) VALUES ('Joe', 'Cool') RETURNING *;

Example 2: postgresql insert select

insert into items_ver(item_id, item_group, name)
select * from items where item_id=2;

Example 3: postgre insert select

insert into TABLENAMEA (A,B,C,D) 
select A,B,C,D from TABLENAMEB