特别提醒:删除数据一定要谨慎
-
表名:dw_invested_company_qmp 两列数据:deal_name, invest_time(除了id)
-
查询出所有重复记录中id最小的一条记录
SELECT COUNT(*) as num,deal_name,invest_time,min(id) as id
FROM dw_invested_company_qmp
GROUP BY deal_name,invest_time having num > 1;
- 取出上一步中所有的id
SELECT e.id FROM
(SELECT COUNT(*) as num,deal_name,invest_time,min(id) as id FROM dw_invested_company_qmp GROUP BY deal_name,invest_time) as e
WHERE e.num>1;
- 根据上一步中得到的id进行删除
DELETE FROM dw_invested_company_qmp
WHERE id IN
(SELECT e.id FROM (SELECT COUNT(*) as num,deal_name,invest_time,min(id) as id FROM dw_invested_company_qmp GROUP BY deal_name,invest_time) as e WHERE e.num>1);