sql 过滤重复记录和查询重复记录

文章介绍利用having group by 及各种select in 联合查询来实现的多种不同方法的过滤重复记录的sql语名. - 1.查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断 代码如下 select * from people where peopleId in (select   peopleId  from   people  group  by   peopleId  having  count(peopleId) > 1) 2.删除表中多余的重复记录,重

1.查找全部重复记录  代码如下 复制代码 Select * From 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1) 2.过滤重复记录(只显示一条)  代码如下 复制代码 Select * From HZT Where ID In (Select Max(ID) From HZT Group By Title) 注:此处显示ID最大一条记录 SQL Server删除重复行是我们最常见的操作之一,下面就为您

问题描述 SQL查询重复记录,怎么写SQL. id A B B C C A A D 要得到这样的 id 数量 A 3 B 2 C 2 D 1 怎么写啊? 解决方案 select id, count(id) as 数量 from 表 group by id 解决方案二: SQL重复记录查询SQL重复记录查询SQL重复记录查询 解决方案三: SELECT id, COUNT(1) AS '数量' FROM 表 GROUP BY id ORDER BY COUNT(1) desc 解决方案四: sel

SQL语句去掉重复记录,获取重复记录  --查询一个表中有效去掉重复的记录,UserID为自增长主键,RoleID为重复字段  代码如下 复制代码 SELECT MIN(UserID) AS UserID, RoleID FROM tmpTable GROUP BY RoleID SELECT RoleID FROM tmpTable GROUP BY RoleID HAVING (COUNT(*) > 1) SELECT DISTINCT * FROM tmpTable sql语句查询 sql

方法1 delete yourtable where [id] not in ( select max([id]) from yourtable group by (name + value)) 方法2 delete a from 表 a left join(select (id) from 表 group by name,value)b on a.id=b.id where b.id is null 查询及删除重复记录的sql语句 1.查找表中多余的重复记录,重复记录是根据单个字段(peopl

SQL在单一表中查询具有重复字段值的记录:主要使用HAVING Count(*)>1方法来实现 SELECT T_User.UserName, T_User.UserID FROM T_User WHERE (((T_User.UserName) In (SELECT [UserName] FROM [T_User] As Tmp GROUP BY [UserName] HAVING Count(*)>1 ))) ORDER BY T_User.UserName;

查找所有重复标题的记录: ? 1 SELECT * FROM t_info a WHERE ((SELECT COUNT(*) FROM t_info WHERE Title = a.Title) > 1) ORDER BY Title DESC 一.查找重复记录 1.查找全部重复记录 ? 1 Select * From 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1) 2.过滤重复记录(只显示一条) ?

查找所有重复标题的记录:     SELECT * FROM t_info a WHERE ((SELECT COUNT(*) FROM t_info WHERE Title = a.Title) > 1) ORDER BY Title DESC   一.查找重复记录 1.查找全部重复记录     Select * From 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1)   2.过滤重复记录(只显示一条

查找所有重复标题的记录: SELECT * FROM t_info a WHERE ((SELECT COUNT(*) FROM t_info WHERE Title = a.Title) > 1) ORDER BY Title DESC  一.查找重复记录 1.查找全部重复记录 Select * From 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1)  2.过滤重复记录(只显示一条) Select *