SQL行列從行數據conversion.converting到列

Question

我輸入作爲

12 abc 
12 def 
34 ghi 

我想輸出

12 abc,def 
34 ghi 

如何使用sql.Thanks實現這一目標！

Answer 1

create table test(id int,val char(3)); 

insert into test values(12,'abc'); 
insert into test values(12,'def'); 
insert into test values(34,'ghi'); 

查詢

SELECT id, LISTAGG(val, ',') WITHIN GROUP (ORDER BY val) AS values 
FROM test 
GROUP BY id; 

SQL Fiddle Demo

Answer 2

我認爲，問題不在於將行轉換爲列（PIVOT），而是關於聚合字符串。 如果你在11.2您可以使用LISTAGG：

with q as (select '12' id, 'abc' col from dual 
union all 
select '12' id, 'def' col from dual 
union all 
select '34' id, 'ghi' col from dual ) 
select id, listagg(col,',') within group (order by col) col_agg 
from q; 

你可以在這裏找到另一個替代方案：如果您在使用Oracle 11g [http://www.oracle-base.com/articles/misc/string-aggregation-techniques.php]