所有版本的oracle都可以使用wm_concat()函式 
例：select wm_concat(name) as name from user;

但如果是oracle11g，使用listagg() within group()函式 
例：select listagg(name, ',' ) within group( order by name) as name from user;

例：

CREATE TABLE MyTest(xType NUMBER,City nvarchar2(200));    
/
INSERT INTO MyTest(xType,City)    
SELECT
 
 1,'北京' FROM dual UNION ALL    
SELECT 1,'上海' FROM dual UNION ALL    
SELECT 1,'廣州' FROM dual UNION ALL    
SELECT 2,'武漢' FROM dual UNION ALL    
SELECT 2,'杭州' FROM dual UNION ALL    
SELECT 2,'廈門' FROM dual    
COMMIT;    

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使用wm_Concat:

SELECT xType,wmsys.wm_concat(to_char(City)) AS xCity FROM
 
 MyTest GROUP BY xType

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使用ListAgg:

SELECT xType, ListAgg(to_char(City),',') WITHIN GROUP(ORDER BY xType) AS xCity FROM MyTest GROUP BY xType 

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結果：

 XTYPE          XCITY
----------   --------------------------------------
   1           北京,廣州,上海
   2           杭州,武漢,廈門http://blog.csdn.net/u014267869/article/details/52195753