Oracle同一字段用逗號分隔(列轉行)

--分組加排序，數據量大時結果會比較慢 

SELECT listagg(t.ename,',') WITHIN GROUP(ORDER BY t.sal) FROM scott.emp t;

--查詢結果為CLOB 

SELECT wm_concat(t.ename) FROM scott.emp t ORDER BY t.sal;