Oracle:行轉列函數,查詢重複記錄函數,過濾表中重複記錄函數

1 行轉列函數: select wm_concat(username) from users 2 查詢重複記錄函數 select t.* from(select t.*,rownum rn from USERS t where t.username in (select username from USERS group by username having count(*) > 1)) t

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