Question

我输入

12 abc
12 def
34 ghi

我希望输出为

12 abc,def
34 ghi

如何使用sql.Thanks实现这一点！

Answer 1

我认为，问题不在于将行转换为列（PIVOT），而是关于聚合字符串。如果你在11.2，你可以使用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;

您可以在此处找到其他替代方案：[http://www.oracle-base.com/articles/misc/string-aggregation-techniques.php]

Answer 2

如果您使用的是oracle 11g

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');

查询

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

SQL Fiddle Demo

sql行到列的转换。将数据从行转换为列

2 个答案: