SQL select - Group by и concatenate (no group_concat)

Question

Мне нужна помощь с проблемой в IBM Informix 12.10. база данных.

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'); 

Я пробовал STUFF, GROUP_CONCAT и LISTAGG.

Initial table: "toys" 

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

Полученная таблица должна выглядеть, как эта:

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

Большое спасибо за вашу помощь!

Answer 1

В Oracle listagg() функция выполняет трюк. Надеемся, что Informix выполняет аналогичную функцию:

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>