Re: Transpose rows to columns

El Lun 12 Ene 2004 22:12, David Witham escribió:
>DW: Hi,
>DW:
>DW: I have a query that returns data like this:
>DW:
>DW: cust_id cust_name month cost revenue margin
>DW: 991234 ABC 2003-07-01 10 15 5
>DW: 991234 ABC 2003-08-01 11 17 6
>DW: 991234 ABC 2003-09-01 12 19 7
>DW: 991235 XYZ 2003-07-01 13 21 8
>DW: 991235 XYZ 2003-08-01 12 19 7
>DW: 991235 XYZ 2003-09-01 11 17 6
>DW:
>DW: I want to turn it around so it displays like this:
>DW:
>DW: 991234,ABC,2003-07-01,10,15,5,2003-08-01,11,17,6,2003-09-01,12,19,7
>DW: 991235,XYZ,2003-07-01,13,21,8,2003-08-01,12,19,7,2003-09-01,11,17,6

Hi, the following query

select cust_id || ', ' || cust_name || ', ' || list(month::text || ', ' ||
cost || ', ' || revenue || ', ' || margin) as result from tmp122 group by
cust_id, cust_name;

*DISPLAYS* data like this:

result
-----------------------------------------------------------------------------
----- 991234, ABC, 2003-07-01, 10, 15, 5, 2003-08-01, 11, 17, 6, 2003-09-01,
12, 19, 7
991235, XYZ, 2003-07-01, 13, 21, 8, 2003-08-01, 12, 19, 7, 2003-09-01, 11,
17, 6
(2 rows)

the type 'list' and the function 'comma_cat' (I cannot remember where I took
it, but are very useful)...

CREATE FUNCTION comma_cat (text, text) RETURNS text
AS 'select case
WHEN $2 is null or $2 = '''' THEN $1
WHEN $1 is null or $1 = '''' THEN $2
ELSE $1 || '', '' || $2
END'
LANGUAGE sql;

CREATE AGGREGATE list (
BASETYPE = text,
SFUNC = comma_cat,
STYPE = text,
INITCOND = ''
);

-- Original data for test --
drop table tmp122;
create temp table tmp122 (
cust_id integer,
cust_name varchar,
month date,
cost integer,
revenue integer,
margin integer
);

copy tmp122 from stdin;
991234 ABC 2003-07-01 10 15 5
991234 ABC 2003-08-01 11 17 6
991234 ABC 2003-09-01 12 19 7
991235 XYZ 2003-07-01 13 21 8
991235 XYZ 2003-08-01 12 19 7
991235 XYZ 2003-09-01 11 17 6
\.

--
Chau, Luis