PostgreSQL/Insert Delete Update/Insert Select
Insert into by select statement
<source lang="sql">
postgres=# postgres=# CREATE TABLE employee ( postgres(# ID int, postgres(# name varchar(10), postgres(# salary real, postgres(# start_date date, postgres(# city varchar(10), postgres(# region char(1) postgres(# ); CREATE TABLE postgres=# postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (1, "Jason", 40420, "02/01/94", "New York", "W"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (2, "Robert",14420, "01/02/95", "Vancouver","N"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (3, "Celia", 24020, "12/03/96", "Toronto", "W"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (4, "Linda", 40620, "11/04/97", "New York", "N"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (5, "David", 80026, "10/05/98", "Vancouver","W"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (6, "James", 70060, "09/06/99", "Toronto", "N"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (7, "Alison",90620, "08/07/00", "New York", "W"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (8, "Chris", 26020, "07/08/01", "Vancouver","N"); INSERT 0 1 postgres=# insert into employee (ID, name, salary, start_date, city, region) postgres-# values (9, "Mary", 60020, "06/09/02", "Toronto", "W"); INSERT 0 1 postgres=# postgres=# select * from employee;
id | name | salary | start_date | city | region
+--------+--------+------------+-----------+--------
1 | Jason | 40420 | 1994-02-01 | New York | W 2 | Robert | 14420 | 1995-01-02 | Vancouver | N 3 | Celia | 24020 | 1996-12-03 | Toronto | W 4 | Linda | 40620 | 1997-11-04 | New York | N 5 | David | 80026 | 1998-10-05 | Vancouver | W 6 | James | 70060 | 1999-09-06 | Toronto | N 7 | Alison | 90620 | 2000-08-07 | New York | W 8 | Chris | 26020 | 2001-07-08 | Vancouver | N 9 | Mary | 60020 | 2002-06-09 | Toronto | W
(9 rows) postgres=# postgres=# CREATE TABLE employee_backup ( postgres(# ID int, postgres(# name varchar(10), postgres(# salary real, postgres(# start_date date, postgres(# city varchar(10), postgres(# region char(1) postgres(# ); CREATE TABLE postgres=# postgres=# INSERT INTO employee_backup SELECT * FROM employee; INSERT 0 9 postgres=# postgres=# select * from employee_backup;
id | name | salary | start_date | city | region
+--------+--------+------------+-----------+--------
1 | Jason | 40420 | 1994-02-01 | New York | W 2 | Robert | 14420 | 1995-01-02 | Vancouver | N 3 | Celia | 24020 | 1996-12-03 | Toronto | W 4 | Linda | 40620 | 1997-11-04 | New York | N 5 | David | 80026 | 1998-10-05 | Vancouver | W 6 | James | 70060 | 1999-09-06 | Toronto | N 7 | Alison | 90620 | 2000-08-07 | New York | W 8 | Chris | 26020 | 2001-07-08 | Vancouver | N 9 | Mary | 60020 | 2002-06-09 | Toronto | W
(9 rows) postgres=# postgres=# drop table employee; DROP TABLE postgres=# drop table employee_backup; DROP TABLE postgres=# postgres=#
</source>
INSERT INTO vv SELECT "abc" || "def"
<source lang="sql">
postgres=# postgres=# CREATE TABLE vv (v character(20)); CREATE TABLE postgres=# postgres=# INSERT INTO vv SELECT "abc" || "def"; INSERT 0 1 postgres=# SELECT v, length(v) FROM vv;
v | length
+--------
abcdef | 6
(1 row) postgres=# postgres=# drop table vv; DROP TABLE postgres=#
</source>
Restructuring a table with CREATE TABLE and INSERT INTO
<source lang="sql">
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=#
</source>
