oracle group by字符串拼接

有一张表test，字段分别是主键ID，road_id，user_id，region，现在的需求是对road_id分组，然后将region字段用逗号拼接起来
test表：

分组的SQL如下：

SELECT road_id , LISTAGG(REGION, ',') WITHIN GROUP (ORDER BY road_id) region 
 FROM rasmp_test WHERE region IS NOT NULL GROUP BY road_id

分组后的结果：

发现region有重复的数字，需要对其进行去重
修改后的SQL如下：

SELECT road_id , LISTAGG(REGION, ',') WITHIN GROUP (ORDER BY road_id) region FROM (
	SELECT DISTINCT road_id, region FROM rasmp_test 
) t1 WHERE region IS NOT NULL GROUP BY road_id;

执行结果：

标签：group,region,test,拼接,SELECT,oracle,GROUP,id,road
来源： https://www.cnblogs.com/jorry-yun/p/16350753.html