查询表中重复数据 select * from employee where employeeId in (select employeeId from employee group by employeeId having count(employeeId) > 1) 删除表中多余 ...
删除数据库中重复的记录,只保留一条 DELETE FROM tb gps records WHERE id NOT IN SELECT bid FROM SELECT min id as bid FROM tb gps records GROUP BY busNo,longitude,latitude as b cityId DELETE FROM tb gps records WHERE cit ...
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查询表中重复数据 select * from employee where employeeId in (select employeeId from employee group by employeeId having count(employeeId) > 1) 删除表中多余 ...
1、查询表中重复数据。select * from people where peopleId in (select peopleId from people group ...
来自 王涛 同志的指导 DELETE FROM product WHERE searchdate IN (SELECT sd FROM (SELECT a.searchdate sd FROM pr ...
正好想写一条删除重复语句并保留一条数据的SQL,网上查了一部分资料写的很详细,但还是在这里写下自己的理解,以遍后续学习 。如下:表字段和数据: SQL语句: [sql] view plain copy ...
{ overflow-x: initial !important } :root { --bg-color: #ffffff; --text-color: #333333; --select-tex ...
SqlServer 删除重复数据 保留最大id的SQL语句 多种方法: --处理表重复记录(查询和删除) /************************************************************************************************************************ ...
大家首先会想到:distinct。有如下数据表A: id title grief 1 标题1 简介1 2 标题2 简介2 3 标题1 简介3 4 标题2 简介2 对于title字段,若实现重复数据只显示一条,可用如下sql语句: select ...
在使用数据库时,如何删除重复数据? 如图所示:用户表(user)数据 1、输入查询语句(查询name重复数据) 查询后,可以看到name叫“张三”的有3条数据。 可以使用distinct去重(返回不重复的用户名) 查询后,name ...