в 13:45, 26 мая 2010

2010-05-26T13:45:56Z

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2010-05-26T10:14:39Z

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==A multi-column sub-query using IN==



<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(# );
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 "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=# -- A multi-column sub-query using IN
postgres=#
postgres=# SELECT isbn, cost, retail FROM stock
postgres-# WHERE (isbn, stock)
postgres-# IN (SELECT isbn, 0 FROM editions
postgres(# WHERE type = "p");
isbn | cost | retail
------------+-------+--------
0451457994 | 17.00 | 22.95
0394900014 | 23.00 | 23.95
(2 rows)
postgres=#
postgres=# drop table stock;
DROP TABLE
postgres=# drop table editions;
DROP TABLE
postgres=#

</source>

==A sub-query using IN==



<source lang="sql">

postgres=#
postgres=# create table job(
postgres(# ID int,
postgres(# title varchar (10));
CREATE TABLE
postgres=#
postgres=#
postgres=# insert into job(ID, title) values(1,"Developer");
INSERT 0 1
postgres=# insert into job(ID, title) values(2,"Tester");
INSERT 0 1
postgres=# insert into job(ID, title) values(3,"Designer");
INSERT 0 1
postgres=# insert into job(ID, title) values(4,"Programmer");
INSERT 0 1
postgres=#
postgres=# select * from job;
id | title
----+------------
1 | Developer
2 | Tester
3 | Designer
4 | Programmer
(4 rows)
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=#
postgres=# -- A sub-query using IN
postgres=#
postgres=# SELECT name FROM employee WHERE id IN (SELECT id FROM job WHERE title ~ "^[A-E]");
name
-------
Jason
Celia
(2 rows)
postgres=#
postgres=#
postgres=#
postgres=# drop table employee;
DROP TABLE
postgres=# drop table job;
DROP TABLE
postgres=#
postgres=#
postgres=#

</source>

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в 13:45, 26 мая 2010

Admin: 1 версия