Hello,
I need to do something similar to a cross tabulation, but without any
aggregation.
Here is an example:
------------------------------------------------------------
-- TABLE DEFINITION
------------------------------------------------------------
CREATE TABLE public.type
(
code char(1) PRIMARY KEY,
type varchar(30)
) WITHOUT OIDS;
CREATE TABLE public.master
(
id int4 PRIMARY KEY,
master_name varchar(30)
) WITHOUT OIDS;
CREATE TABLE public.detail
(
id int4 PRIMARY KEY,
code_type char(1) REFERENCES public.type,
id_master int4 REFERENCES public.master,
detail_name varchar(30)
) WITHOUT OIDS;
------------------------------------------------------------
-- DATA
------------------------------------------------------------
INSERT INTO public.type VALUES('A', 'TA');
INSERT INTO public.type VALUES('B', 'TB');
INSERT INTO public.type VALUES('C', 'TC');
INSERT INTO public.master VALUES(1, 'M1');
INSERT INTO public.master VALUES(2, 'M2');
INSERT INTO public.master VALUES(3, 'M3');
INSERT INTO public.detail VALUES(1, 'A', 1, 'M1, D1');
INSERT INTO public.detail VALUES(2, 'B', 1, 'M1, D2');
INSERT INTO public.detail VALUES(3, 'A', 1, 'M1, D3');
INSERT INTO public.detail VALUES(4, 'C', 1, 'M1, D4');
INSERT INTO public.detail VALUES(5, 'C', 2, 'M2, D1');
INSERT INTO public.detail VALUES(6, 'A', 3, 'M3, D1');
INSERT INTO public.detail VALUES(7, 'A', 3, 'M3, D2');
INSERT INTO public.detail VALUES(8, 'B', 3, 'M3, D3');
INSERT INTO public.detail VALUES(9, 'A', 3, 'M3, D4');
INSERT INTO public.detail VALUES(10, 'B', 3, 'M3, D5');
INSERT INTO public.detail VALUES(11, 'C', 3, 'M3, D6');
INSERT INTO public.detail VALUES(12, 'C', 3, 'M3, D7');
------------------------------------------------------------
-- QUERY
------------------------------------------------------------
SELECT
master_name,
detail_name,
type
FROM
master INNER JOIN detail
ON master.id = detail.id_master
INNER JOIN type
ON detail.code_type = type.code
ORDER by master.id, detail.id;
------------------------------------------------------------
The result of that is:
----------------------------------
master_name | detail_name | type |
----------------------------------
M1 | M1, D1 | TA |
M1 | M1, D2 | TB |
M1 | M1, D3 | TA |
M1 | M1, D4 | TC |
M2 | M2, D1 | TC |
M3 | M3, D1 | TA |
M3 | M3, D2 | TA |
M3 | M3, D3 | TB |
M3 | M3, D4 | TA |
M3 | M3, D5 | TB |
M3 | M3, D6 | TC |
M3 | M3, D7 | TC |
----------------------------------
I need something like this:
----------------------------------------
master_name | TA | TB | TC |
----------------------------------------
M1 | M1, D1 | | |
M1 | | M1, D2 | |
M1 | M1, D3 | | |
M1 | | | M1, D4 |
M2 | | | M2, D1 |
M3 | M3, D1 | | |
M3 | M3, D2 | | |
M3 | | M3, D3 | |
M3 | M3, D4 | | |
M3 | | M3, D5 | |
M3 | | | M3, D6 |
M3 | | | M3, D7 |
----------------------------------------
Does anyone know how to do that in Postgresql? I run version 7.3.4.
Thanks for any idea you might have.
Philippe Lang
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