в 13:45, 26 мая 2010

2010-05-26T13:45:56Z

Admin: 1 версия

2010-05-26T10:14:30Z

1 версия

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==Creates a view of all publishers whose names begin with H==



<source lang="sql">

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=# -- Creates a view of all publishers whose names begin with H:
postgres=#
postgres=# CREATE VIEW h_publishers AS
postgres-# SELECT * FROM publishers WHERE name LIKE "H%";
CREATE VIEW
postgres=#
postgres=# select * from h_publishers;
id | name | address
----+------------+-------------------------
91 | Henry Inc. | 115 Street New York, NY
65 | H Pubs | 10 E 53rd St, New York
(2 rows)
postgres=#
postgres=# drop view h_publishers;
DROP VIEW
postgres=# drop table publishers;
DROP TABLE
postgres=#
postgres=#

</source>

==Create view from the user defined function==



<source lang="sql">

postgres=#
postgres=# CREATE TABLE myTable (
postgres(# id int,
postgres(# sid int,
postgres(# name text);
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into myTable values(1,2,"a");
INSERT 0 1
postgres=# insert into myTable values(2,3,"b");
INSERT 0 1
postgres=#
postgres=# select * from myTable;
id | sid | name
----+-----+------
1 | 2 | a
2 | 3 | b
(2 rows)
postgres=#
postgres=#
postgres=#
postgres=# CREATE FUNCTION getData(int) RETURNS SETOF myTable AS $$
postgres$# SELECT * FROM myTable WHERE id = $1;
postgres$# $$ LANGUAGE SQL;
CREATE FUNCTION
postgres=#
postgres=#
postgres=# CREATE VIEW vw_GetData AS SELECT * FROM getData(1);
CREATE VIEW
postgres=#
postgres=# SELECT * FROM vw_GetData;
id | sid | name
----+-----+------
1 | 2 | a
(1 row)
postgres=#
postgres=# drop function getData(int) cascade;
NOTICE: drop cascades to rule _RETURN on view vw_getdata
NOTICE: drop cascades to view vw_getdata
DROP FUNCTION
postgres=# drop view vw_GetData cascade;
ERROR: view "vw_getdata" does not exist
postgres=# drop table myTable cascade;
DROP TABLE
postgres=#
postgres=#

</source>

==Creating a view with a natural join statement==



<source lang="sql">

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=#

</source>

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PostgreSQL/View/Create View - История изменений

в 13:45, 26 мая 2010

Admin: 1 версия