MySQL 創建唯一索引忽略對已經重復數據的檢查

在創建唯一索引的基礎上加上關鍵字"IGNORE?"即可。

# 重復數據

mysql> select aid,count(aid) as total ,email,tel_no,account_type,exten,passwd from fudao_admin group by user_name having total> 1;

+-------+-------+--------------------------+--------+--------------+-------+----------------------------------+

| aid | total | email | tel_no | account_type | exten | passwd |

+-------+-------+--------------------------+--------+--------------+-------+----------------------------------+

| 256 | 5 | | | 0 | | |

| 4712 | 2 | bin.liu@wenba100.com | 0 | 0 | | 1afc079897c2de73022540f7c31db632 |

| 1070 | 2 | feng.wang@wenba100.com | | 0 | | c81103a50f7b7748303ede9726eed91a |

| 10429 | 2 | jingxuan.li@wenba100.com | 0 | 0 | 1090 | 9bd7aa138ff1486e1285a412bda934dd |

| 10425 | 2 | 843633577@qq.com | 0 | 0 | | 96e79218965eb72c92a549dd5a330112 |

| 10426 | 2 | 843633577@qq.com | 0 | 0 | | 96e79218965eb72c92a549dd5a330112 |

| 1402 | 2 | wei.liu@wenba100.com | | 0 | | 72d1e186ab204c937ea48a3ff9f926fa |

| 3385 | 2 | xiao.li@wenba100.com | 0 | 0 | | 263cad88649b39ed9fc95739c4f20edc |

+-------+-------+--------------------------+--------+--------------+-------+----------------------------------+

8 rows in set (0.25 sec)

mysql> ALTER IGNORE TABLE fudao_admin ADD UNIQUE `uq_user_name` (user_name);

Query OK, 13530 rows affected, 1 warning (0.44 sec)

Records: 13530 Duplicates: 11 Warnings: 1

mysql> select aid,count(aid) as total ,email,tel_no,account_type,exten,passwd from fudao_admin group by user_name having total> 1;

Empty set (0.08 sec)

標簽：wenba100,name,忽略,索引,user,MySQL,aid,total,com

來源： https://www.cnblogs.com/bjx2020/p/11778445.html

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