Restructuring a table with CREATE TABLE and INSERT INTO : Insert Select « Insert Delete Update « PostgreSQL

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3. Insert Select

Restructuring a table with CREATE TABLE and INSERT INTO

postgres=# CREATE TABLE books (
postgres(#               id integer UNIQUE,
postgres(#               title text NOT NULL,
postgres(#               author_id  integer,
postgres(#               subject_id integer);
NOTICE:  CREATE TABLE / UNIQUE will create implicit index "books_id_key" for table "books"
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into books values(7808,  'Java',                  4156, 9);
INSERT 0 1
postgres=# insert into books values(4513,  'Javascript',            1866, 15);
INSERT 0 1
postgres=# insert into books values(4267,  'C#',                    2001, 15);
INSERT 0 1
postgres=# insert into books values(1608,  'Oracle',                1809, 2);
INSERT 0 1
postgres=# insert into books values(1590,  'Sql Server',            1809, 2);
INSERT 0 1
postgres=# insert into books values(25908, 'Postgre SQL',          15990, 2);
INSERT 0 1
postgres=# insert into books values(1501,  'Python',                2031, 2);
INSERT 0 1
postgres=# insert into books values(190,   'Java by API',             16, 6);
INSERT 0 1
postgres=#
postgres=#
postgres=# select * from books;
  id   |    title    | author_id | subject_id
-------+-------------+-----------+------------
  7808 | Java        |      4156 |          9
  4513 | Javascript  |      1866 |         15
  4267 | C#          |      2001 |         15
  1608 | Oracle      |      1809 |          2
  1590 | Sql Server  |      1809 |          2
 25908 | Postgre SQL |     15990 |          2
  1501 | Python      |      2031 |          2
   190 | Java by API |        16 |          6
(8 rows)

postgres=#
postgres=# --Restructuring a table with CREATE TABLE and INSERT INTO
postgres=#
postgres=# CREATE TABLE new_books (
postgres(#    id integer UNIQUE,
postgres(#    title text NOT NULL,
postgres(#    author_id integer,
postgres(#    subject_id integer
postgres(#  );
NOTICE:  CREATE TABLE / UNIQUE will create implicit index "new_books_id_key" for table "new_books"
CREATE TABLE
postgres=#
postgres=# INSERT INTO new_books
postgres-#              SELECT id, title, author_id, subject_id
postgres-#                     FROM books;
INSERT 0 8
postgres=#
postgres=# ALTER TABLE books RENAME TO old_books;
ALTER TABLE
postgres=#
postgres=# ALTER TABLE new_books RENAME TO books;
ALTER TABLE
postgres=#
postgres=# drop table books;
DROP TABLE
postgres=# drop table old_books;
DROP TABLE
postgres=#
postgres=#

           
       

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