postgresql insert into select from another table code example

Example 1: postgresql insert select

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

Example 2: postgre insert select

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

Example 3: postgres trigger insert into another table

CREATE TRIGGER trig_copy
     AFTER INSERT ON table1
     FOR EACH ROW
     EXECUTE PROCEDURE function_copy();

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