oracle语句中把一列的值合并为一个值

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

但如果是oracle11g，使用listagg() within group()函数
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,’广州’ FROM dual UNION ALL
SELECT 2,’武汉’ FROM dual UNION ALL
SELECT 2,’杭州’ FROM dual UNION ALL
SELECT 2,’厦门’ FROM dual
COMMIT;

使用wm_Concat:

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

使用ListAgg:

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

结果： XTYPE XCITY ———- ————————————– 1 北京,广州,上海 2 杭州,武汉,厦门

（编辑：李大同）

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