DB2 SQL：將結果中具有相同標識的記錄分組？

Question

如果我有2列

text | id 
--------- 
aaa | 1 
bbb | 1 
eee | 1 
mmm | 2 
zzz | 2 
... 

表是否有可能通過ID寫這組查詢和輸出結果如下：

id | text 
------------------ 
1 | aaa, bbb, eee 
2 | mmm, zzz 
... 

謝謝！如果你希望他們按字母順序排列

select id, listagg(text, ', ') as text 
from t 
group by id 

：

Answer 1

試試這個，

SELECT ID, 
     SUBSTR(xmlserialize(xmlagg(xmltext(CONCAT(', ',text))) as VARCHAR(1024)), 3) 
FROM tableName 
GROUP BY ID; 

Answer 2

使用listagg功能DB2

select id, listagg(text, ', ') within group (order by text) as text 
from t 
group by id