Creating a view with a natural join statement
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(# CONSTRAINT "integrity" CHECK (((book_id NOTNULL) AND (edition NOTNULL))),
postgres(# Constraint "pkey" Primary Key ("isbn")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "pkey" for table "editions"
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=# CREATE TABLE "shipments" (
postgres(# "id" integer DEFAULT nextval('"shipments_ship_id_seq"'::text) NOT NULL,
postgres(# "customer_id" integer,
postgres(# "isbn" text,
postgres(# "ship_date" timestamp with time zone
postgres(# );
CREATE TABLE
postgres=#
postgres=# insert into shipments values (375, 142, '039480001X','2004-01-06 09:19:21-01');
INSERT 0 1
postgres=# insert into shipments values (323, 671, '0451160916','2004-02-14 10:26:41-02');
INSERT 0 1
postgres=# insert into shipments values (998, 1045, '0590445065','2004-03-12 12:39:47-03');
INSERT 0 1
postgres=# insert into shipments values (749, 172, '0694003611','2003-04-11 10:42:34-04');
INSERT 0 1
postgres=# insert into shipments values (662, 655, '0679803335','2003-05-09 07:50:07-05');
INSERT 0 1
postgres=# insert into shipments values (806, 1125, '0760720002','2003-06-05 09:14:04-06');
INSERT 0 1
postgres=# insert into shipments values (102, 146, '0394900014','2002-07-11 13:24:08-07');
INSERT 0 1
postgres=# insert into shipments values (813, 112, '0385121679','2002-08-08 09:33:46-08');
INSERT 0 1
postgres=# insert into shipments values (652, 724, '1885418035','2002-09-14 13:41:39-09');
INSERT 0 1
postgres=# insert into shipments values (599, 430, '0929605942','2001-01-10 08:59:42-01');
INSERT 0 1
postgres=# insert into shipments values (969, 488, '0441172717','2006-02-14 08:12:58-02');
INSERT 0 1
postgres=# insert into shipments values (433, 898, '044100590X','2006-03-12 08:26:35-03');
INSERT 0 1
postgres=# insert into shipments values (660, 409, '0451457994','2006-04-07 11:36:42-04');
INSERT 0 1
postgres=# insert into shipments values (310, 738, '0451198492','2005-04-15 14:42:01-05');
INSERT 0 1
postgres=# insert into shipments values (510, 860, '0823015505','2005-05-14 07:53:47-06');
INSERT 0 1
postgres=# insert into shipments values (997, 185, '039480001X','2005-05-10 13:47:52-07');
INSERT 0 1
postgres=# insert into shipments values (999, 221, '0451160916','2005-06-14 13:45:51-08');
INSERT 0 1
postgres=# insert into shipments values (56, 880, '0590445065','2005-05-14 13:39:00-09');
INSERT 0 1
postgres=# insert into shipments values (72, 574, '0694003611','2004-04-06 07:29:44-00');
INSERT 0 1
postgres=# insert into shipments values (146, 270, '039480001X','2004-03-13 09:12:10-01');
INSERT 0 1
postgres=# insert into shipments values (981, 652, '0451160916','2003-02-08 08:46:44-02');
INSERT 0 1
postgres=# insert into shipments values (95, 480, '0590445065','2003-01-10 07:29:52-03');
INSERT 0 1
postgres=# insert into shipments values (593, 476, '0694003611','2002-03-15 11:17:40-04');
INSERT 0 1
postgres=# insert into shipments values (977, 853, '0679803335','2002-05-09 09:20:46-05');
INSERT 0 1
postgres=# insert into shipments values (117, 185, '0760720002','2005-05-07 13:30:48-06');
INSERT 0 1
postgres=# insert into shipments values (406, 1123, '0394900014','2004-04-13 09:41:04-07');
INSERT 0 1
postgres=# insert into shipments values (340, 1149, '0385121679','2003-02-12 13:21:22-08');
INSERT 0 1
postgres=# insert into shipments values (871, 388, '1885418035','2003-03-07 11:41:57-09');
INSERT 0 1
postgres=# insert into shipments values (1000, 221, '039480001X','2002-05-14 16:46:32-01');
INSERT 0 1
postgres=# insert into shipments values (1001, 107, '039480001X','2001-02-14 17:42:22-02');
INSERT 0 1
postgres=# insert into shipments values (754, 107, '0394800753','2006-05-11 09:55:05-03');
INSERT 0 1
postgres=# insert into shipments values (458, 107, '0394800753','2005-06-07 10:58:36-04');
INSERT 0 1
postgres=# insert into shipments values (189, 107, '0394800753','2004-03-06 11:46:36-04');
INSERT 0 1
postgres=# insert into shipments values (720, 107, '0394800753','2003-02-08 10:36:13-05');
INSERT 0 1
postgres=# insert into shipments values (1002, 107, '0394800753','2002-09-22 11:23:28-06');
INSERT 0 1
postgres=# insert into shipments values (2, 107, '0394800753','2001-09-22 20:18:56-07');
INSERT 0 1
postgres=#
postgres=# select * from shipments;
id | customer_id | isbn | ship_date
------+-------------+------------+------------------------
375 | 142 | 039480001X | 2004-01-06 02:19:21-08
323 | 671 | 0451160916 | 2004-02-14 04:26:41-08
998 | 1045 | 0590445065 | 2004-03-12 07:39:47-08
749 | 172 | 0694003611 | 2003-04-11 07:42:34-07
662 | 655 | 0679803335 | 2003-05-09 05:50:07-07
806 | 1125 | 0760720002 | 2003-06-05 08:14:04-07
102 | 146 | 0394900014 | 2002-07-11 13:24:08-07
813 | 112 | 0385121679 | 2002-08-08 10:33:46-07
652 | 724 | 1885418035 | 2002-09-14 15:41:39-07
599 | 430 | 0929605942 | 2001-01-10 01:59:42-08
969 | 488 | 0441172717 | 2006-02-14 02:12:58-08
433 | 898 | 044100590X | 2006-03-12 03:26:35-08
660 | 409 | 0451457994 | 2006-04-07 08:36:42-07
310 | 738 | 0451198492 | 2005-04-15 12:42:01-07
510 | 860 | 0823015505 | 2005-05-14 06:53:47-07
997 | 185 | 039480001X | 2005-05-10 13:47:52-07
999 | 221 | 0451160916 | 2005-06-14 14:45:51-07
56 | 880 | 0590445065 | 2005-05-14 15:39:00-07
72 | 574 | 0694003611 | 2004-04-06 00:29:44-07
146 | 270 | 039480001X | 2004-03-13 02:12:10-08
981 | 652 | 0451160916 | 2003-02-08 02:46:44-08
95 | 480 | 0590445065 | 2003-01-10 02:29:52-08
593 | 476 | 0694003611 | 2002-03-15 07:17:40-08
977 | 853 | 0679803335 | 2002-05-09 07:20:46-07
117 | 185 | 0760720002 | 2005-05-07 12:30:48-07
406 | 1123 | 0394900014 | 2004-04-13 09:41:04-07
340 | 1149 | 0385121679 | 2003-02-12 13:21:22-08
871 | 388 | 1885418035 | 2003-03-07 12:41:57-08
1000 | 221 | 039480001X | 2002-05-14 10:46:32-07
1001 | 107 | 039480001X | 2001-02-14 11:42:22-08
754 | 107 | 0394800753 | 2006-05-11 05:55:05-07
458 | 107 | 0394800753 | 2005-06-07 07:58:36-07
189 | 107 | 0394800753 | 2004-03-06 07:46:36-08
720 | 107 | 0394800753 | 2003-02-08 07:36:13-08
1002 | 107 | 0394800753 | 2002-09-22 10:23:28-07
2 | 107 | 0394800753 | 2001-09-22 20:18:56-07
(36 rows)
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=#
postgres=#
postgres=#
postgres=# -- Creating a view
postgres=#
postgres=# CREATE VIEW recent_shipments
postgres-# AS SELECT count(*) AS num_shipped, max(ship_date), title
postgres-# FROM shipments
postgres-# JOIN editions USING (isbn)
postgres-# NATURAL JOIN books AS b (book_id)
postgres-# GROUP BY b.title
postgres-# ORDER BY num_shipped DESC;
CREATE VIEW
postgres=#
postgres=# select * from recent_shipments;
num_shipped | max | title
-------------+------------------------+-------------
7 | 2005-05-10 13:47:52-07 | Oracle
6 | 2006-05-11 05:55:05-07 | Sql Server
5 | 2005-06-14 14:45:51-07 | Java
3 | 2005-05-14 15:39:00-07 | Postgre SQL
3 | 2004-04-06 00:29:44-07 | Python
3 | 2003-03-07 12:41:57-08 | C++
2 | 2003-05-09 05:50:07-07 | 2D
2 | 2005-05-07 12:30:48-07 | Java by API
2 | 2006-03-12 03:26:35-08 | Javascript
2 | 2006-04-07 08:36:42-07 | C#
1 | 2005-05-14 06:53:47-07 | C
(11 rows)
postgres=#
postgres=# SELECT * FROM recent_shipments
postgres-# ORDER BY max DESC
postgres-# LIMIT 3;
num_shipped | max | title
-------------+------------------------+------------
6 | 2006-05-11 05:55:05-07 | Sql Server
2 | 2006-04-07 08:36:42-07 | C#
2 | 2006-03-12 03:26:35-08 | Javascript
(3 rows)
postgres=#
postgres=#
postgres=#
postgres=#
postgres=# drop view recent_shipments;
DROP VIEW
postgres=#
postgres=# drop table books;
DROP TABLE
postgres=# drop table editions;
DROP TABLE
postgres=# drop table shipments;
DROP TABLE
postgres=#
postgres=#
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