sql查询某字段重复数据
@汝露882:sql语句怎么查询某个字段的值是否重复 -
段颖17263609774…… SELECT 某一列, COUNT( 某一列 ) FROM 表 GROUP BY 某一列 HAVING COUNT( 某一列 ) 〉1 这样查询出来的结果, 就是 有重复, 而且 重复的数量.
@汝露882:sql怎么查询两个字段相同的记录? -
段颖17263609774…… 1、查询重复的数据,只查询重复记录,不管其余信息,如ID什么的: 1select uid, time from ztest GROUP BY uid, time having count(*)>1; 查出结果是 uid time 1 1 2、SQL语言,是结构化查询语言(Structured Query Language)的简称.SQL语...
@汝露882:sql中怎么查询一个字段中相同值 -
段颖17263609774…… select id from 表 group by id having count(id)>1
@汝露882:怎么利用SQL语句查询数据库中具体某个字段的重复行 -
段颖17263609774…… 可用group by……having来实现.可做如下测试:1、创建表插入数据:create table test(id int,name varchar(10)) insert into test values (1,'张三') insert into test values (2,'李四') insert into test values (3,'张三') insert into test values (4,'王五') ...
@汝露882:如何用SQL查询出一个字段内重复的记录数量及排列出来 一... -
段颖17263609774…… lect username, count(*) from tongji group by date order by count(*)
@汝露882:如何用sql 查找两个字段重复的记录,并列出重复记录 -
段颖17263609774…… 如何用sql 查找两个字段重复的记录,并列出重复记录 select * from shiyan003 a where exists (select 1 from (select xm, sfzhm from shiyan003 group by xm, sfzhm having count(*) > 1) s where s.xm = a.xm and s.sfzhm = a.sfzhm)
@汝露882:SQL语句怎么查重复数据? -
段颖17263609774…… select count(字段) from table select count(distinct 字段) from table 不相等就说明有重复字段了 然后再查重复值 select count(字段) as total,字段 from table where total > 1 group by 字段
@汝露882:如何用SQL语句查询两张表中的相同字段数据 -
段颖17263609774…… 查询 这两张表的数据 select t1.codeid ,t1.cedename from table1 t1 union all select t2.codeid ,t2.cedename from table1 t2 查询 这两张表的数据(去掉重复数据) select t1.codeid ,t1.cedename from table1 t1 union select t2.codeid ,t2.cedename from table1 t2
@汝露882:sql 表中怎么根据多个字段查询重复数据, -
段颖17263609774…… 、查找表中多余的重复记录(多个字段) select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) 4、删除表中多余的重复记录(多个字段),只留有rowid最小的记录 delete from ...
@汝露882:SQL中如何查询某个表中某个字段在一定时间差内出现的重复数据以及重复的次数 -
段颖17263609774…… 你时间差需要有一个字段记录时间,假设叫time select distinct(column_name),count(1) as num from table_name where time between time1 and time2 having num > 1 order by num
段颖17263609774…… SELECT 某一列, COUNT( 某一列 ) FROM 表 GROUP BY 某一列 HAVING COUNT( 某一列 ) 〉1 这样查询出来的结果, 就是 有重复, 而且 重复的数量.
@汝露882:sql怎么查询两个字段相同的记录? -
段颖17263609774…… 1、查询重复的数据,只查询重复记录,不管其余信息,如ID什么的: 1select uid, time from ztest GROUP BY uid, time having count(*)>1; 查出结果是 uid time 1 1 2、SQL语言,是结构化查询语言(Structured Query Language)的简称.SQL语...
@汝露882:sql中怎么查询一个字段中相同值 -
段颖17263609774…… select id from 表 group by id having count(id)>1
@汝露882:怎么利用SQL语句查询数据库中具体某个字段的重复行 -
段颖17263609774…… 可用group by……having来实现.可做如下测试:1、创建表插入数据:create table test(id int,name varchar(10)) insert into test values (1,'张三') insert into test values (2,'李四') insert into test values (3,'张三') insert into test values (4,'王五') ...
@汝露882:如何用SQL查询出一个字段内重复的记录数量及排列出来 一... -
段颖17263609774…… lect username, count(*) from tongji group by date order by count(*)
@汝露882:如何用sql 查找两个字段重复的记录,并列出重复记录 -
段颖17263609774…… 如何用sql 查找两个字段重复的记录,并列出重复记录 select * from shiyan003 a where exists (select 1 from (select xm, sfzhm from shiyan003 group by xm, sfzhm having count(*) > 1) s where s.xm = a.xm and s.sfzhm = a.sfzhm)
@汝露882:SQL语句怎么查重复数据? -
段颖17263609774…… select count(字段) from table select count(distinct 字段) from table 不相等就说明有重复字段了 然后再查重复值 select count(字段) as total,字段 from table where total > 1 group by 字段
@汝露882:如何用SQL语句查询两张表中的相同字段数据 -
段颖17263609774…… 查询 这两张表的数据 select t1.codeid ,t1.cedename from table1 t1 union all select t2.codeid ,t2.cedename from table1 t2 查询 这两张表的数据(去掉重复数据) select t1.codeid ,t1.cedename from table1 t1 union select t2.codeid ,t2.cedename from table1 t2
@汝露882:sql 表中怎么根据多个字段查询重复数据, -
段颖17263609774…… 、查找表中多余的重复记录(多个字段) select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) 4、删除表中多余的重复记录(多个字段),只留有rowid最小的记录 delete from ...
@汝露882:SQL中如何查询某个表中某个字段在一定时间差内出现的重复数据以及重复的次数 -
段颖17263609774…… 你时间差需要有一个字段记录时间,假设叫time select distinct(column_name),count(1) as num from table_name where time between time1 and time2 having num > 1 order by num