PostgreSQL primary key auto increment method

The PG primary key is auto-incremented, similar to oracle
1. First create the sequence
CREATE SEQUENCE test_c_id_seq
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE
    NO MAXVALUE
    CACHE 1;
[size=14px;] [/size]
[size=14px;][size=14px ;][size=14px;]2. If the table already exists, execute the following statement: [/size][/size][/size]
alter table test_c alter column id set default nextval('test_c_id_seq');
[size =14px;] [/size]
[size=14px;]3. If the table does not exist, then: [/size]
[size=14px;]create table table_name([/size]
[size=14px;] id int not null primary key default nextval('id_seq'),[/size]
[size=14px;] name varchar(30)
[/size]

[size=14px;])[/size]


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