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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=# -- A SQL function that returns a book title based on the ID number passed to the function
postgres=#
postgres=# CREATE FUNCTION title(integer) RETURNS text
postgres-# AS 'SELECT title from books where id = $1'
postgres-# LANGUAGE 'sql';
CREATE FUNCTION
postgres=#
postgres=# SELECT title(41472) AS book_title;
book_title
----------------------
Practical PostgreSQL
(1 row)
postgres=#
postgres=# drop function title(integer);
DROP FUNCTION
postgres=# drop table books;
DROP TABLE
postgres=#
postgres=#
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