ORACLE 某一列数据合并为字符串，用逗号分开

用 LISTAGG(字段，分隔符) WITHIN GROUP (ORDER BY 字段) 将列合并为字符串

SELECT DISTRICT_CODE from DISTRICT_TABLE

SELECT LISTAGG ( DISTRICT_CODE, ',' ) WITHIN GROUP ( ORDER BY DISTRICT_CODE ) AS DISTRICT_CODE from DISTRICT_TABLE