postgresql-刪除重復數據保留一條

1.常規刪除方法
explain analyse delete from deltest a where a.ctid <> (select min(t.ctid) from deltest t where a.id=t.id);
2.group by刪除方法
explain analyse delete from deltest a where a.ctid not in (select min(ctid) from deltest group by id);
3.row_number刪除方法
explain analyze delete from deltest a where a.ctid = any(array (select ctid from (select row_number() over (partition by id), ctid from deltest) t where t.row_number > 1));

根據某個字段分組刪除重復數據，只保留日期最大的一條，建議使用窗口函數效率更高