PostgreSQL/Table Joins/Table Join — различия между версиями
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Текущая версия на 10:13, 26 мая 2010
Содержание
Aliasing columns
postgres=#
postgres=#
postgres=# CREATE TABLE "books" (
postgres(# "id" integer NOT NULL,
postgres(# "title" text NOT NULL,
postgres(# "author_id" integer,
postgres(# "subject_id" integer,
postgres(# Constraint "books_id_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "books_id_pkey" 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=# insert into books values (1234, "2D", 25041, 3);
INSERT 0 1
postgres=# insert into books values (2038, "C", 1644, 0);
INSERT 0 1
postgres=# insert into books values (156, "C++", 115, 9);
INSERT 0 1
postgres=# insert into books values (41473, "Programming Python", 7805, 4);
INSERT 0 1
postgres=# insert into books values (41477, "Learning Python", 7805, 4);
INSERT 0 1
postgres=# insert into books values (41478, "Perl Cookbook", 7806, 4);
INSERT 0 1
postgres=# insert into books values (41472, "Practical PostgreSQL", 1212, 4);
INSERT 0 1
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
1234 | 2D | 25041 | 3
2038 | C | 1644 | 0
156 | C++ | 115 | 9
41473 | Programming Python | 7805 | 4
41477 | Learning Python | 7805 | 4
41478 | Perl Cookbook | 7806 | 4
41472 | Practical PostgreSQL | 1212 | 4
(15 rows)
postgres=#
postgres=# CREATE TABLE "authors" (
postgres(# "id" integer NOT NULL,
postgres(# "last_name" text,
postgres(# "first_name" text,
postgres(# Constraint "authors_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "authors_pkey" for table "authors"
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into authors values (1111, "Martin", "Jason");
INSERT 0 1
postgres=# insert into authors values (1212, "Worsley", "Robert");
INSERT 0 1
postgres=# insert into authors values (15990, "Mathews", "John");
INSERT 0 1
postgres=# insert into authors values (25041, "Smith", "Williams");
INSERT 0 1
postgres=# insert into authors values (16, "Alcott", "May");
INSERT 0 1
postgres=# insert into authors values (4156, "King", "Stephen");
INSERT 0 1
postgres=# insert into authors values (1866, "Herbert", "Margaret");
INSERT 0 1
postgres=# insert into authors values (1644, "Hogarth", "Celia");
INSERT 0 1
postgres=# insert into authors values (2031, "Brown", "Wise");
INSERT 0 1
postgres=# insert into authors values (115, "Poe", "Allen");
INSERT 0 1
postgres=# insert into authors values (7805, "Lutz", "Mark");
INSERT 0 1
postgres=# insert into authors values (7806, "Rice", "Tom");
INSERT 0 1
postgres=# insert into authors values (1533, "Black", "Chris");
INSERT 0 1
postgres=# insert into authors values (1717, "Brite", "Linda");
INSERT 0 1
postgres=# insert into authors values (2112, "Larry", "Edward");
INSERT 0 1
postgres=# insert into authors values (2001, "Clarke", "Alison");
INSERT 0 1
postgres=# insert into authors values (1213, "Green", "Mary");
INSERT 0 1
postgres=#
postgres=# select * from authors;
id | last_name | first_name
-------+-----------+------------
1111 | Martin | Jason
1212 | Worsley | Robert
15990 | Mathews | John
25041 | Smith | Williams
16 | Alcott | May
4156 | King | Stephen
1866 | Herbert | Margaret
1644 | Hogarth | Celia
2031 | Brown | Wise
115 | Poe | Allen
7805 | Lutz | Mark
7806 | Rice | Tom
1533 | Black | Chris
1717 | Brite | Linda
2112 | Larry | Edward
2001 | Clarke | Alison
1213 | Green | Mary
(17 rows)
postgres=#
postgres=# -- Aliasing columns
postgres=#
postgres=# SELECT the_book_id, title, id, last_name
postgres-# FROM books AS b (the_book_id), authors
postgres-# WHERE author_id = id;
the_book_id | title | id | last_name
-------------+----------------------+-------+-----------
7808 | Java | 4156 | King
4513 | Javascript | 1866 | Herbert
4267 | C# | 2001 | Clarke
25908 | Postgre SQL | 15990 | Mathews
1501 | Python | 2031 | Brown
190 | Java by API | 16 | Alcott
1234 | 2D | 25041 | Smith
2038 | C | 1644 | Hogarth
156 | C++ | 115 | Poe
41473 | Programming Python | 7805 | Lutz
41477 | Learning Python | 7805 | Lutz
41478 | Perl Cookbook | 7806 | Rice
41472 | Practical PostgreSQL | 1212 | Worsley
(13 rows)
postgres=#
postgres=#
postgres=#
postgres=# drop table authors;
DROP TABLE
postgres=# drop table books;
DROP TABLE
postgres=#
postgres=#
Aliasing FROM sources
postgres=#
postgres=# CREATE TABLE "books" (
postgres(# "id" integer NOT NULL,
postgres(# "title" text NOT NULL,
postgres(# "author_id" integer,
postgres(# "subject_id" integer,
postgres(# Constraint "books_id_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "books_id_pkey" 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=# insert into books values (1234, "2D", 25041, 3);
INSERT 0 1
postgres=# insert into books values (2038, "C", 1644, 0);
INSERT 0 1
postgres=# insert into books values (156, "C++", 115, 9);
INSERT 0 1
postgres=# insert into books values (41473, "Programming Python", 7805, 4);
INSERT 0 1
postgres=# insert into books values (41477, "Learning Python", 7805, 4);
INSERT 0 1
postgres=# insert into books values (41478, "Perl Cookbook", 7806, 4);
INSERT 0 1
postgres=# insert into books values (41472, "Practical PostgreSQL", 1212, 4);
INSERT 0 1
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
1234 | 2D | 25041 | 3
2038 | C | 1644 | 0
156 | C++ | 115 | 9
41473 | Programming Python | 7805 | 4
41477 | Learning Python | 7805 | 4
41478 | Perl Cookbook | 7806 | 4
41472 | Practical PostgreSQL | 1212 | 4
(15 rows)
postgres=#
postgres=# CREATE TABLE "authors" (
postgres(# "id" integer NOT NULL,
postgres(# "last_name" text,
postgres(# "first_name" text,
postgres(# Constraint "authors_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "authors_pkey" for table "authors"
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into authors values (1111, "Martin", "Jason");
INSERT 0 1
postgres=# insert into authors values (1212, "Worsley", "Robert");
INSERT 0 1
postgres=# insert into authors values (15990, "Mathews", "John");
INSERT 0 1
postgres=# insert into authors values (25041, "Smith", "Williams");
INSERT 0 1
postgres=# insert into authors values (16, "Alcott", "May");
INSERT 0 1
postgres=# insert into authors values (4156, "King", "Stephen");
INSERT 0 1
postgres=# insert into authors values (1866, "Herbert", "Margaret");
INSERT 0 1
postgres=# insert into authors values (1644, "Hogarth", "Celia");
INSERT 0 1
postgres=# insert into authors values (2031, "Brown", "Wise");
INSERT 0 1
postgres=# insert into authors values (115, "Poe", "Allen");
INSERT 0 1
postgres=# insert into authors values (7805, "Lutz", "Mark");
INSERT 0 1
postgres=# insert into authors values (7806, "Rice", "Tom");
INSERT 0 1
postgres=# insert into authors values (1533, "Black", "Chris");
INSERT 0 1
postgres=# insert into authors values (1717, "Brite", "Linda");
INSERT 0 1
postgres=# insert into authors values (2112, "Larry", "Edward");
INSERT 0 1
postgres=# insert into authors values (2001, "Clarke", "Alison");
INSERT 0 1
postgres=# insert into authors values (1213, "Green", "Mary");
INSERT 0 1
postgres=#
postgres=# select * from authors;
id | last_name | first_name
-------+-----------+------------
1111 | Martin | Jason
1212 | Worsley | Robert
15990 | Mathews | John
25041 | Smith | Williams
16 | Alcott | May
4156 | King | Stephen
1866 | Herbert | Margaret
1644 | Hogarth | Celia
2031 | Brown | Wise
115 | Poe | Allen
7805 | Lutz | Mark
7806 | Rice | Tom
1533 | Black | Chris
1717 | Brite | Linda
2112 | Larry | Edward
2001 | Clarke | Alison
1213 | Green | Mary
(17 rows)
postgres=#
postgres=# -- Aliasing FROM sources
postgres=#
postgres=# SELECT b.id, title, a.id, last_name
postgres-# FROM books AS b, authors AS a
postgres-# WHERE b.author_id = a.id;
id | title | id | last_name
-------+----------------------+-------+-----------
7808 | Java | 4156 | King
4513 | Javascript | 1866 | Herbert
4267 | C# | 2001 | Clarke
25908 | Postgre SQL | 15990 | Mathews
1501 | Python | 2031 | Brown
190 | Java by API | 16 | Alcott
1234 | 2D | 25041 | Smith
2038 | C | 1644 | Hogarth
156 | C++ | 115 | Poe
41473 | Programming Python | 7805 | Lutz
41477 | Learning Python | 7805 | Lutz
41478 | Perl Cookbook | 7806 | Rice
41472 | Practical PostgreSQL | 1212 | Worsley
(13 rows)
postgres=#
postgres=#
postgres=#
postgres=# drop table authors;
DROP TABLE
postgres=# drop table books;
DROP TABLE
postgres=#
postgres=#
Join three tables together
postgres=#
postgres=#
postgres=# CREATE TABLE "editions" (
postgres(# "isbn" text NOT NULL,
postgres(# "book_id" integer,
postgres(# "edition" integer,
postgres(# "publisher_id" integer,
postgres(# "publication" date,
postgres(# "type" character(1)
postgres(# );
CREATE TABLE
postgres=#
postgres=# insert into editions values("039480001X", 1608, 1, 59, "1957-03-01", "h");
INSERT 0 1
postgres=# insert into editions values("0451160916", 7808, 1, 75, "1981-08-01", "p");
INSERT 0 1
postgres=# insert into editions values("0394800753", 1590, 1, 59, "1949-03-01", "p");
INSERT 0 1
postgres=# insert into editions values("0590445065", 25908, 1, 150, "1987-03-01", "p");
INSERT 0 1
postgres=# insert into editions values("0694003611", 1501, 1, 65, "1947-03-04", "p");
INSERT 0 1
postgres=# insert into editions values("0679803335", 1234, 1, 102, "1922-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0760720002", 190, 1, 91, "1868-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0394900014", 1608, 1, 59, "1957-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0385121679", 7808, 2, 75, "1993-10-01", "h");
INSERT 0 1
postgres=# insert into editions values("1885418035", 156, 1, 163, "1995-03-28", "p");
INSERT 0 1
postgres=# insert into editions values("0929605942", 156, 2, 171, "1998-12-01", "p");
INSERT 0 1
postgres=# insert into editions values("0441172717", 4513, 2, 99, "1998-09-01", "p");
INSERT 0 1
postgres=# insert into editions values("044100590X", 4513, 3, 99, "1999-10-01", "h");
INSERT 0 1
postgres=# insert into editions values("0451457994", 4267, 3, 101, "2000-09-12", "p");
INSERT 0 1
postgres=# insert into editions values("0451198492", 4267, 3, 101, "1999-10-01", "h");
INSERT 0 1
postgres=# insert into editions values("0823015505", 2038, 1, 62, "1958-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0596000855", 41473, 2, 113, "2001-03-01", "p");
INSERT 0 1
postgres=#
postgres=# select * from editions;
isbn | book_id | edition | publisher_id | publication | type
------------+---------+---------+--------------+-------------+------
039480001X | 1608 | 1 | 59 | 1957-03-01 | h
0451160916 | 7808 | 1 | 75 | 1981-08-01 | p
0394800753 | 1590 | 1 | 59 | 1949-03-01 | p
0590445065 | 25908 | 1 | 150 | 1987-03-01 | p
0694003611 | 1501 | 1 | 65 | 1947-03-04 | p
0679803335 | 1234 | 1 | 102 | 1922-01-01 | p
0760720002 | 190 | 1 | 91 | 1868-01-01 | p
0394900014 | 1608 | 1 | 59 | 1957-01-01 | p
0385121679 | 7808 | 2 | 75 | 1993-10-01 | h
1885418035 | 156 | 1 | 163 | 1995-03-28 | p
0929605942 | 156 | 2 | 171 | 1998-12-01 | p
0441172717 | 4513 | 2 | 99 | 1998-09-01 | p
044100590X | 4513 | 3 | 99 | 1999-10-01 | h
0451457994 | 4267 | 3 | 101 | 2000-09-12 | p
0451198492 | 4267 | 3 | 101 | 1999-10-01 | h
0823015505 | 2038 | 1 | 62 | 1958-01-01 | p
0596000855 | 41473 | 2 | 113 | 2001-03-01 | p
(17 rows)
postgres=#
postgres=#
postgres=# CREATE TABLE "publishers" (
postgres(# "id" integer NOT NULL,
postgres(# "name" text,
postgres(# "address" text,
postgres(# Constraint "publishers_pkey" Primary Key ("id")
postgres(# );
postgres=#
postgres=#
postgres=# insert into publishers values(150, "Can Press", "29 Ave. Toronto, ON");
postgres=# insert into publishers values(91, "Henry Inc.", "115 Street New York, NY");
postgres=# insert into publishers values(113, "O Inc.", "101 St, Sebastopol, CA");
postgres=# insert into publishers values(62, "W Pubs", "1515, New York");
postgres=# insert into publishers values(105, "N Press", "19 W, New York");
postgres=# insert into publishers values(99, "A Inc", "375 St, New York");
postgres=# insert into publishers values(101, "Z Inc", "375 Ave, New York");
postgres=# insert into publishers values(163, "M Press", "PO Box 1215");
postgres=# insert into publishers values(171, "B", "16 W. 18th St. New York");
postgres=# insert into publishers values(102, "P Inc", "375 Hudson St, New York");
postgres=# insert into publishers values(75, "D Inc", "1540 Broadway, New York");
postgres=# insert into publishers values(65, "H Pubs", "10 E 53rd St, New York");
postgres=# insert into publishers values(59, "R Inc", "1540 Broadway, New York");
postgres=#
postgres=# select * from publishers;
id | name | address
-----+------------+-------------------------
150 | Can Press | 29 Ave. Toronto, ON
91 | Henry Inc. | 115 Street New York, NY
113 | O Inc. | 101 St, Sebastopol, CA
62 | W Pubs | 1515, New York
105 | N Press | 19 W, New York
99 | A Inc | 375 St, New York
101 | Z Inc | 375 Ave, New York
163 | M Press | PO Box 1215
171 | B | 16 W. 18th St. New York
102 | P Inc | 375 Hudson St, New York
75 | D Inc | 1540 Broadway, New York
65 | H Pubs | 10 E 53rd St, New York
59 | R Inc | 1540 Broadway, New York
(13 rows)
postgres=#
postgres=#
postgres=# CREATE TABLE "stock" (
postgres(# "isbn" text NOT NULL,
postgres(# "cost" numeric(5,2),
postgres(# "retail" numeric(5,2),
postgres(# "stock" integer,
postgres(# Constraint "stock_pkey" Primary Key ("isbn")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "stock_pkey" for table "stock"
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into stock values ("0385121679", 29.00, 36.95, 65);
INSERT 0 1
postgres=# insert into stock values ("039480001X", 30.00, 32.95, 31);
INSERT 0 1
postgres=# insert into stock values ("0394900014", 23.00, 23.95, 0);
INSERT 0 1
postgres=# insert into stock values ("044100590X", 36.00, 45.95, 89);
INSERT 0 1
postgres=# insert into stock values ("0441172717", 17.00, 21.95, 77);
INSERT 0 1
postgres=# insert into stock values ("0451160916", 24.00, 28.95, 22);
INSERT 0 1
postgres=# insert into stock values ("0451198492", 36.00, 46.95, 0);
INSERT 0 1
postgres=# insert into stock values ("0451457994", 17.00, 22.95, 0);
INSERT 0 1
postgres=# insert into stock values ("0590445065", 23.00, 23.95, 10);
INSERT 0 1
postgres=# insert into stock values ("0679803335", 20.00, 24.95, 18);
INSERT 0 1
postgres=# insert into stock values ("0694003611", 25.00, 28.95, 50);
INSERT 0 1
postgres=# insert into stock values ("0760720002", 18.00, 23.95, 28);
INSERT 0 1
postgres=# insert into stock values ("0823015505", 26.00, 28.95, 16);
INSERT 0 1
postgres=# insert into stock values ("0929605942", 19.00, 21.95, 25);
INSERT 0 1
postgres=# insert into stock values ("1885418035", 23.00, 24.95, 77);
INSERT 0 1
postgres=# insert into stock values ("0394800753", 16.00, 16.95, 4);
INSERT 0 1
postgres=#
postgres=# select * FROM stock;
isbn | cost | retail | stock
------------+-------+--------+-------
0385121679 | 29.00 | 36.95 | 65
039480001X | 30.00 | 32.95 | 31
0394900014 | 23.00 | 23.95 | 0
044100590X | 36.00 | 45.95 | 89
0441172717 | 17.00 | 21.95 | 77
0451160916 | 24.00 | 28.95 | 22
0451198492 | 36.00 | 46.95 | 0
0451457994 | 17.00 | 22.95 | 0
0590445065 | 23.00 | 23.95 | 10
0679803335 | 20.00 | 24.95 | 18
0694003611 | 25.00 | 28.95 | 50
0760720002 | 18.00 | 23.95 | 28
0823015505 | 26.00 | 28.95 | 16
0929605942 | 19.00 | 21.95 | 25
1885418035 | 23.00 | 24.95 | 77
0394800753 | 16.00 | 16.95 | 4
(16 rows)
postgres=#
postgres=#
postgres=#
postgres=#
postgres=# SELECT avg(cost) AS average_cost, p.name AS publisher
postgres-# FROM (stock JOIN editions USING (isbn))
postgres-# JOIN publishers AS p (publisher_id)
postgres-# USING (publisher_id)
postgres-# GROUP BY p.name;
average_cost | publisher
---------------------+------------
19.0000000000000000 | B
26.5000000000000000 | D Inc
26.5000000000000000 | A Inc
25.0000000000000000 | H Pubs
26.0000000000000000 | W Pubs
20.0000000000000000 | P Inc
26.5000000000000000 | Z Inc
23.0000000000000000 | Can Press
23.0000000000000000 | R Inc
23.0000000000000000 | M Press
18.0000000000000000 | Henry Inc.
(11 rows)
postgres=#
postgres=# drop table publishers;
DROP TABLE
postgres=# drop table editions;
DROP TABLE
postgres=#
Join two tables with order by and group by
postgres=#
postgres=#
postgres=# CREATE TABLE "editions" (
postgres(# "isbn" text NOT NULL,
postgres(# "book_id" integer,
postgres(# "edition" integer,
postgres(# "publisher_id" integer,
postgres(# "publication" date,
postgres(# "type" character(1)
postgres(# );
CREATE TABLE
postgres=#
postgres=# insert into editions values("039480001X", 1608, 1, 59, "1957-03-01", "h");
INSERT 0 1
postgres=# insert into editions values("0451160916", 7808, 1, 75, "1981-08-01", "p");
INSERT 0 1
postgres=# insert into editions values("0394800753", 1590, 1, 59, "1949-03-01", "p");
INSERT 0 1
postgres=# insert into editions values("0590445065", 25908, 1, 150, "1987-03-01", "p");
INSERT 0 1
postgres=# insert into editions values("0694003611", 1501, 1, 65, "1947-03-04", "p");
INSERT 0 1
postgres=# insert into editions values("0679803335", 1234, 1, 102, "1922-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0760720002", 190, 1, 91, "1868-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0394900014", 1608, 1, 59, "1957-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0385121679", 7808, 2, 75, "1993-10-01", "h");
INSERT 0 1
postgres=# insert into editions values("1885418035", 156, 1, 163, "1995-03-28", "p");
INSERT 0 1
postgres=# insert into editions values("0929605942", 156, 2, 171, "1998-12-01", "p");
INSERT 0 1
postgres=# insert into editions values("0441172717", 4513, 2, 99, "1998-09-01", "p");
INSERT 0 1
postgres=# insert into editions values("044100590X", 4513, 3, 99, "1999-10-01", "h");
INSERT 0 1
postgres=# insert into editions values("0451457994", 4267, 3, 101, "2000-09-12", "p");
INSERT 0 1
postgres=# insert into editions values("0451198492", 4267, 3, 101, "1999-10-01", "h");
INSERT 0 1
postgres=# insert into editions values("0823015505", 2038, 1, 62, "1958-01-01", "p");
INSERT 0 1
postgres=# insert into editions values("0596000855", 41473, 2, 113, "2001-03-01", "p");
INSERT 0 1
postgres=#
postgres=# select * from editions;
isbn | book_id | edition | publisher_id | publication | type
------------+---------+---------+--------------+-------------+------
039480001X | 1608 | 1 | 59 | 1957-03-01 | h
0451160916 | 7808 | 1 | 75 | 1981-08-01 | p
0394800753 | 1590 | 1 | 59 | 1949-03-01 | p
0590445065 | 25908 | 1 | 150 | 1987-03-01 | p
0694003611 | 1501 | 1 | 65 | 1947-03-04 | p
0679803335 | 1234 | 1 | 102 | 1922-01-01 | p
0760720002 | 190 | 1 | 91 | 1868-01-01 | p
0394900014 | 1608 | 1 | 59 | 1957-01-01 | p
0385121679 | 7808 | 2 | 75 | 1993-10-01 | h
1885418035 | 156 | 1 | 163 | 1995-03-28 | p
0929605942 | 156 | 2 | 171 | 1998-12-01 | p
0441172717 | 4513 | 2 | 99 | 1998-09-01 | p
044100590X | 4513 | 3 | 99 | 1999-10-01 | h
0451457994 | 4267 | 3 | 101 | 2000-09-12 | p
0451198492 | 4267 | 3 | 101 | 1999-10-01 | h
0823015505 | 2038 | 1 | 62 | 1958-01-01 | p
0596000855 | 41473 | 2 | 113 | 2001-03-01 | p
(17 rows)
postgres=#
postgres=#
postgres=# CREATE TABLE "publishers" (
postgres(# "id" integer NOT NULL,
postgres(# "name" text,
postgres(# "address" text,
postgres(# Constraint "publishers_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "publishers_pkey" for table "publishers"
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into publishers values(150, "Can Press", "29 Ave. Toronto, ON");
INSERT 0 1
postgres=# insert into publishers values(91, "Henry Inc.", "115 Street New York, NY");
INSERT 0 1
postgres=# insert into publishers values(113, "O Inc.", "101 St, Sebastopol, CA");
INSERT 0 1
postgres=# insert into publishers values(62, "W Pubs", "1515, New York");
INSERT 0 1
postgres=# insert into publishers values(105, "N Press", "19 W, New York");
INSERT 0 1
postgres=# insert into publishers values(99, "A Inc", "375 St, New York");
INSERT 0 1
postgres=# insert into publishers values(101, "Z Inc", "375 Ave, New York");
INSERT 0 1
postgres=# insert into publishers values(163, "M Press", "PO Box 1215");
INSERT 0 1
postgres=# insert into publishers values(171, "B", "16 W. 18th St. New York");
INSERT 0 1
postgres=# insert into publishers values(102, "P Inc", "375 Hudson St, New York");
INSERT 0 1
postgres=# insert into publishers values(75, "D Inc", "1540 Broadway, New York");
INSERT 0 1
postgres=# insert into publishers values(65, "H Pubs", "10 E 53rd St, New York");
INSERT 0 1
postgres=# insert into publishers values(59, "R Inc", "1540 Broadway, New York");
INSERT 0 1
postgres=#
postgres=# select * from publishers;
id | name | address
-----+------------+-------------------------
150 | Can Press | 29 Ave. Toronto, ON
91 | Henry Inc. | 115 Street New York, NY
113 | O Inc. | 101 St, Sebastopol, CA
62 | W Pubs | 1515, New York
105 | N Press | 19 W, New York
99 | A Inc | 375 St, New York
101 | Z Inc | 375 Ave, New York
163 | M Press | PO Box 1215
171 | B | 16 W. 18th St. New York
102 | P Inc | 375 Hudson St, New York
75 | D Inc | 1540 Broadway, New York
65 | H Pubs | 10 E 53rd St, New York
59 | R Inc | 1540 Broadway, New York
(13 rows)
postgres=#
postgres=# SELECT count(book_id), p.name
postgres-# FROM editions JOIN publishers AS p (publisher_id)
postgres-# USING (publisher_id)
postgres-# GROUP BY p.name
postgres-# ORDER BY count DESC;
count | name
-------+------------
3 | R Inc
2 | Z Inc
2 | A Inc
2 | D Inc
1 | W Pubs
1 | P Inc
1 | H Pubs
1 | O Inc.
1 | Can Press
1 | B
1 | M Press
1 | Henry Inc.
(12 rows)
postgres=#
postgres=# drop table editions;
DROP TABLE
postgres=# drop table publishers;
DROP TABLE
postgres=#
Selecting from multiple table sources
postgres=#
postgres=#
postgres=#
postgres=#
postgres=#
postgres=#
postgres=# CREATE TABLE "books" (
postgres(# "id" integer NOT NULL,
postgres(# "title" text NOT NULL,
postgres(# "author_id" integer,
postgres(# "subject_id" integer,
postgres(# Constraint "books_id_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "books_id_pkey" 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=# insert into books values (1234, "2D", 25041, 3);
INSERT 0 1
postgres=# insert into books values (2038, "C", 1644, 0);
INSERT 0 1
postgres=# insert into books values (156, "C++", 115, 9);
INSERT 0 1
postgres=# insert into books values (41473, "Programming Python", 7805, 4);
INSERT 0 1
postgres=# insert into books values (41477, "Learning Python", 7805, 4);
INSERT 0 1
postgres=# insert into books values (41478, "Perl Cookbook", 7806, 4);
INSERT 0 1
postgres=# insert into books values (41472, "Practical PostgreSQL", 1212, 4);
INSERT 0 1
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
1234 | 2D | 25041 | 3
2038 | C | 1644 | 0
156 | C++ | 115 | 9
41473 | Programming Python | 7805 | 4
41477 | Learning Python | 7805 | 4
41478 | Perl Cookbook | 7806 | 4
41472 | Practical PostgreSQL | 1212 | 4
(15 rows)
postgres=#
postgres=# CREATE TABLE "authors" (
postgres(# "id" integer NOT NULL,
postgres(# "last_name" text,
postgres(# "first_name" text,
postgres(# Constraint "authors_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "authors_pkey" for table "authors"
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into authors values (1111, "Martin", "Jason");
INSERT 0 1
postgres=# insert into authors values (1212, "Worsley", "Robert");
INSERT 0 1
postgres=# insert into authors values (15990, "Mathews", "John");
INSERT 0 1
postgres=# insert into authors values (25041, "Smith", "Williams");
INSERT 0 1
postgres=# insert into authors values (16, "Alcott", "May");
INSERT 0 1
postgres=# insert into authors values (4156, "King", "Stephen");
INSERT 0 1
postgres=# insert into authors values (1866, "Herbert", "Margaret");
INSERT 0 1
postgres=# insert into authors values (1644, "Hogarth", "Celia");
INSERT 0 1
postgres=# insert into authors values (2031, "Brown", "Wise");
INSERT 0 1
postgres=# insert into authors values (115, "Poe", "Allen");
INSERT 0 1
postgres=# insert into authors values (7805, "Lutz", "Mark");
INSERT 0 1
postgres=# insert into authors values (7806, "Rice", "Tom");
INSERT 0 1
postgres=# insert into authors values (1533, "Black", "Chris");
INSERT 0 1
postgres=# insert into authors values (1717, "Brite", "Linda");
INSERT 0 1
postgres=# insert into authors values (2112, "Larry", "Edward");
INSERT 0 1
postgres=# insert into authors values (2001, "Clarke", "Alison");
INSERT 0 1
postgres=# insert into authors values (1213, "Green", "Mary");
INSERT 0 1
postgres=#
postgres=# select * from authors;
id | last_name | first_name
-------+-----------+------------
1111 | Martin | Jason
1212 | Worsley | Robert
15990 | Mathews | John
25041 | Smith | Williams
16 | Alcott | May
4156 | King | Stephen
1866 | Herbert | Margaret
1644 | Hogarth | Celia
2031 | Brown | Wise
115 | Poe | Allen
7805 | Lutz | Mark
7806 | Rice | Tom
1533 | Black | Chris
1717 | Brite | Linda
2112 | Larry | Edward
2001 | Clarke | Alison
1213 | Green | Mary
(17 rows)
postgres=#
postgres=# -- Selecting from multiple table sources
postgres=#
postgres=# SELECT books.id, title, authors.id, last_name
postgres-# FROM books, authors
postgres-# WHERE books.author_id = authors.id;
id | title | id | last_name
-------+----------------------+-------+-----------
7808 | Java | 4156 | King
4513 | Javascript | 1866 | Herbert
4267 | C# | 2001 | Clarke
25908 | Postgre SQL | 15990 | Mathews
1501 | Python | 2031 | Brown
190 | Java by API | 16 | Alcott
1234 | 2D | 25041 | Smith
2038 | C | 1644 | Hogarth
156 | C++ | 115 | Poe
41473 | Programming Python | 7805 | Lutz
41477 | Learning Python | 7805 | Lutz
41478 | Perl Cookbook | 7806 | Rice
41472 | Practical PostgreSQL | 1212 | Worsley
(13 rows)
postgres=#
postgres=#
postgres=#
postgres=# drop table authors;
DROP TABLE
postgres=# drop table books;
DROP TABLE