|
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=# CREATE TABLE "subjects" (
postgres(# "id" integer NOT NULL,
postgres(# "subject" text,
postgres(# "location" text,
postgres(# Constraint "subjects_pkey" Primary Key ("id")
postgres(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "subjects_pkey" for table "subjects"
CREATE TABLE
postgres=#
postgres=# insert into subjects values (0, 'Arts', 'Creativity St');
INSERT 0 1
postgres=# insert into subjects values (1, 'Business', 'Productivity Ave');
INSERT 0 1
postgres=# insert into subjects values (2, 'Children', 'Books Kids Ct');
INSERT 0 1
postgres=# insert into subjects values (3, 'Classics', 'Academic Rd');
INSERT 0 1
postgres=# insert into subjects values (4, 'Computers', 'Productivity Ave');
INSERT 0 1
postgres=# insert into subjects values (5, 'Cooking', 'Creativity St');
INSERT 0 1
postgres=# insert into subjects values (6, 'Drama', 'Main St');
INSERT 0 1
postgres=# insert into subjects values (7, 'Entertainment', 'Main St');
INSERT 0 1
postgres=# insert into subjects values (8, 'History', 'Academic Rd');
INSERT 0 1
postgres=# insert into subjects values (9, 'Horror', 'Black Raven Dr');
INSERT 0 1
postgres=# insert into subjects values (10, 'Mystery', 'Black Raven Dr');
INSERT 0 1
postgres=# insert into subjects values (11, 'Poetry', 'Sunset Dr');
INSERT 0 1
postgres=# insert into subjects values (12, 'Religion', 'Regina');
INSERT 0 1
postgres=# insert into subjects values (13, 'Romance', 'Main St');
INSERT 0 1
postgres=# insert into subjects values (14, 'Science', 'Productivity Ave');
INSERT 0 1
postgres=# insert into subjects values (15, 'Science Fiction', 'Main St');
INSERT 0 1
postgres=#
postgres=# select * from subjects;
id | subject | location
----+-----------------+------------------
0 | Arts | Creativity St
1 | Business | Productivity Ave
2 | Children | Books Kids Ct
3 | Classics | Academic Rd
4 | Computers | Productivity Ave
5 | Cooking | Creativity St
6 | Drama | Main St
7 | Entertainment | Main St
8 | History | Academic Rd
9 | Horror | Black Raven Dr
10 | Mystery | Black Raven Dr
11 | Poetry | Sunset Dr
12 | Religion | Regina
13 | Romance | Main St
14 | Science | Productivity Ave
15 | Science Fiction | Main St
(16 rows)
postgres=#
postgres=#
postgres=#
postgres=# drop function extract_all_titles2();
DROP FUNCTION
postgres=#
postgres=# CREATE FUNCTION "extract_all_titles2" () RETURNS text AS '
postgres'# DECLARE
postgres'# sub_id INTEGER;
postgres'# text_output TEXT = '' '';
postgres'# sub_title TEXT;
postgres'# row_data books%ROWTYPE;
postgres'# BEGIN
postgres'# FOR i IN 0..15 LOOP
postgres'# SELECT INTO sub_title subject FROM subjects WHERE id = i;
postgres'# text_output = text_output || '''' || sub_title || '':'';
postgres'#
postgres'# FOR row_data IN SELECT * FROM books
postgres'# WHERE subject_id = i LOOP
postgres'#
postgres'# text_output := text_output || row_data.title || '''';
postgres'#
postgres'# END LOOP;
postgres'# END LOOP;
postgres'# RETURN text_output;
postgres'# END;
postgres'# ' LANGUAGE 'plpgsql';
CREATE FUNCTION
postgres=#
postgres=# select extract_all_titles2();
extract_all_titles2
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Arts:CBusiness:Children:OracleSql ServerPostgre SQLPythonClassics:2DComputers:Programming PythonLearning PythonPerl CookbookPractical PostgreSQLCooking:Drama:Java by APIEntertainment:History:Horror:JavaC++Mystery:Poetry:Religion:Romance:Science:Science Fiction:JavascriptC#
(1 row)
postgres=#
postgres=#
postgres=# drop table books;
DROP TABLE
postgres=# drop table subjects;
DROP TABLE
postgres=#
|