Add a column : Add Column « Table « PostgreSQL

1. PostgreSQL
2. Table
3. Add Column

Add a column

postgres=#
postgres=# -- Creating the books table
postgres=#
postgres=# CREATE TABLE books (
postgres(#               id integer UNIQUE,
postgres(#               title text NOT NULL,
postgres(#               author_id  integer,
postgres(#               subject_id integer,
postgres(#               CONSTRAINT books_id_pkey PRIMARY KEY (id));
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "books_id_pkey" for table "books"
CREATE TABLE
postgres=#
postgres=# \d books;
       Table "public.books"
   Column   |  Type   | Modifiers
------------+---------+-----------
 id         | integer | not null
 title      | text    | not null
 author_id  | integer |
 subject_id | integer |
Indexes:
    "books_id_pkey" PRIMARY KEY, btree (id)

postgres=#
postgres=# -- Adding a column
postgres=#
postgres=# ALTER TABLE books ADD publication date;
ALTER TABLE
postgres=#
postgres=#
postgres=# \d books;
       Table "public.books"
   Column    |  Type   | Modifiers
-------------+---------+-----------
 id          | integer | not null
 title       | text    | not null
 author_id   | integer |
 subject_id  | integer |
 publication | date    |
Indexes:
    "books_id_pkey" PRIMARY KEY, btree (id)

postgres=#
postgres=# drop table books;
DROP TABLE
postgres=#
postgres=#
           
       

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