表结构: LOAD DATA INFILE '/usr/local/phone_imsi_12' replace INTO TABLE tbl_imsi2number_new FIELDS TERMINATED BY '\t' ENCLOSED BY '' (number,imsi); 先用SQL语句来进行去重操作: delete from tbl_imsi2number_new where imsi in (select imsi from (select imsi from tbl_imsi…

删除表中重复记录,只保留一条: delete from 表名 where 字段ID in (select * from (select max(字段ID) from 表名 group by 重复的字段 having count(重复的字段) > 1) as b); 查询重复数据select * from prpmlossitem where CaseNo in ( select CaseNo from prpmlossitem group by CaseNo having count(CaseN…

演示数据,仅供参考 查询表结构: mysql> desc test; +-------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+------------------+------+-----+---------+----------------+ ) unsigned | NO | PRI | NULL…

1. 创建存储过程batchDeleteField:删除所有名称为"MyDB_"开头的数据库中的指定字段 -- ---------------------------- -- Procedure structure for batchDeleteField -- ---------------------------- DROP PROCEDURE IF EXISTS `batchDeleteField`; DELIMITER ;; ),)) BEGIN #数据库名称 ); #声明结束…

create proc insertLog@Title nvarchar(50),@Contents nvarchar(max),@UserId int,@CreateTime datetimeasinsert into Logs values(@Title,@Contents,@UserId,@CreateTime)goexec insertLog 'admin','admin',1,'2018-11-19' 看一下存储过程的定义: 存储过程就是一组为了完成特定功能的SQL 语句集,存储在数据…

 delete from co_jobinformation cwhere c.name in (select cc.name from co_jobinformation cc group by  cc.name   having count(cc.name) > 1)and rowid not in (select min(rowid) from co_jobinformation e group by e.name having count(e.name )>1)  之前在oracle数…

删除重复行 DELETE FROM ecm_member_login_session WHERE (number , client_code) IN ( ) AND update_time NOT IN ( ); 但是报1093错误 :: ) ) Error Code: . You can't specify target table 'ecm_member_login_session' for update in FROM clause 0.046 sec 后来在 嵌套查询语句里面再嵌套一层即…

MYSQL里有五百万数据,但大多是重复的,真实的就180万,于是想怎样把这些重复的数据搞出来,在网上找了一圈,好多是用NOT IN这样的代码,这样效率很低,自己琢磨组合了一下,找到一个高效的处理方式,用这个方式,五百万数据,十来分钟就全部去除重复了,请各位参考. 第一步:从500万数据表data_content_152里提取出不重复的字段SFZHM对应的ID字段到TMP3表 create table tmp3 as select min(id) as col1 from data_content…

Mysql利用联表查询和分组来删除重复数据 //删除表中重复的id,保留最大的id mysql> select * from user; +----+------+ | id | name | +----+------+ | | a | | | b | | | c | | | d | | | a | | | a | | | c | | | d | +----+------+ rows in set (0.08 sec) mysql> delete a ) b on a .name = b.na…

mysql删除重复数据只保留一条 新建一张测试表: CREATE TABLE `book` ( `id` char(32) NOT NULL DEFAULT '', `name` varchar(100) DEFAULT NULL, `parent_id` char(32) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=gbk; 测试数据: INSERT INTO `book` VALUES ('1', 'n1'…