SQL select - Gruppieren nach und verketten (kein group_concat)

Question

Ich brauche Hilfe mit einem Problem auf einem IBM Informix 12.10. Datenbank.

CREATE TABLE toys(product VARCHAR(255), colour VARCHAR(255)); 
INSERT INTO toys (product, colour) 
VALUES ('balloon', 'red'), 
('balloon', 'white'), 
('balloon', 'green'), 
('balloon', 'yellow'), 
('rubber duck', 'yellow'), 
('rubber duck', 'white'); 

Ich versuchte STUFF, GROUP_CONCAT und LISTAGG.

Initial table: "toys" 

product  | colour 
----------------------- 
balloon  | red 
balloon  | green 
balloon  | white 
balloon  | yellow 
rubber duck | yellow 
rubber duck | white 

Die resultierende Tabelle wie die aussehen soll:

product  | colours 
----------------------- 
balloon  | red, green, white, yellow 
rubber duck | yellow, white 

Vielen Dank für Ihre Hilfe!

Answer 1

In Oracle funktioniert die listagg() Funktion. Hoffentlich hat Informix eine ähnliche Funktion:

SQL> column PRODUCT format A20 
SQL> column COLOURS format A40 
SQL> with tbl(product, colour) as (
    select 'balloon', 'red' from dual union 
    select 'balloon', 'green' from dual union 
    select 'balloon', 'white' from dual union 
    select 'balloon', 'yellow' from dual union 
    select 'rubber duck', 'yellow' from dual union 
    select 'rubber duck', 'white' from dual 
    ) 
    select product, listagg(colour, ', ') within group (order by colour) as colours 
    from tbl 
    group by product; 

PRODUCT    COLOURS 
-------------------- ---------------------------------------- 
balloon    green, red, white, yellow 
rubber duck   white, yellow 

SQL>