oracle 删除重复数据的方法

最新推荐文章于 2025-07-02 00:06:23 发布

翻译最新推荐文章于 2025-07-02 00:06:23 发布 · 522 阅读

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原文链接：https://blog.youkuaiyun.com/langlelangle/article/details/103934638?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-0.no_search_link&spm=1001.2101.3001.4242.1

文章标签：

#oracle #数据库 #database

本文介绍了如何使用SQL语句删除表格中满足特定条件的重复记录，如当某个字段（如ryid和bc_xm）出现多次且周次(c_zc)为43时，仅保留唯一行。通过IN和NOT IN子句结合GROUP BY和HAVING操作，确保只删除具有重复值但非最小ROWID的行。

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1.单个字段

DELETE from 表 WHERE (id) IN ( SELECT id FROM 表 GROUP BY id HAVING COUNT(id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表
GROUP BY id HAVING COUNT(*) > 1);

例子：删除周次为43且ryid重复的数据

delete from bc_ry_his where c_zc=43 and ryid in(select ryid from bc_ry_his group by ryid having count(ryid)>1) and rowid not in
(select min(rowid) from bc_ry_his group by ryid having count(*)>1)

2.多个字段

delete from 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)

例子：删除周次为43且ryid,bc_xm 重复的数据

delete from bc_ry_his where c_zc=43 and (ryid,bc_xm) in(select ryid,bc_xm from bc_ry_his group by ryid,bc_xm having count(*)>1) and rowid not in
(select min(rowid) from bc_ry_his group by ryid,bc_xm having count(*)>1)