plsql怎么查重复数据
2023-05-07 23:19:57
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问:plsql查询重复数据 例如表T1,有两个字段A、B,内容如下 A B a 1 a 1 a 2 a 2 b 1 b 1 b 2 b 2
- 答:select A,count(1)
from(select distinct A,B from T1 )a
group by A - 答:SELECT A,COUNT(B) FROM T1 GROUP BY A
问:SQL查询语句,怎样查询重复数据
- 答:select id, name, memo
from A
where id in (select id from A group by id having count(1) >= 2) - 答:1、第一步,打开数据库,并创建一个包含重复数据的新用户表,见下图,转到下面的步骤。
2、第二步,执行完上面的操作之后,输入如下红框中的SQL语句,然后单击运行按钮,以查看数据库中用户表中的重复数据,见下图,转到下面的步骤。
3、第三步,执行完上面的操作之后,查找出了具有重复名称的数据,见下图,转到下面的步骤。
4、第四步,执行完上面的操作之后,可以使用如下语句来去除重复数据,见下图,转到下面的步骤。
5、第五步,执行完上面的操作之后,最终删除了同一类中的重复数据,见下图。这样,就解决了这个问题了。
- 答:select id,count(*) from A group by A.id havinig count(*)>1;
- 答:selectid,name,memo
fromA
whereidin(selectidfromAgroupbyidhavingcount(1)>=2)
1查询 abcd相同的记录:
select * from F where a=b and b=c and c=d
2查询有重复数据的记录
select * from F group by a,b,c,d having count(*)>1
3取出数据过滤到重复的数据
select distinct a,b,c,d from f - 答:select id,count(1) 重复次数 from A group by id having count(1)>1;
查询出来的结果都是id重复的,重复次数 中的数值就是重复了多少次。 - 答:select id,count(1) as num from table where num>1 group by id
- 答:查询重复数据,方法如下:
select * from [表A] where id in (select id from [表A] group by id having count(id) >1 ) - 答:是要把重复的ID查出来嘛?
select id
from A
group by id
Having count(id)>1 - 答:select id, name, memo from A where id in (select id from A group by id having count(1) >= 2)
- 答:select count(*),id from 表名 group by id having count(*)>1
- 答:我们假如在goods表中id是唯一的,其中name可能会相同,现在要查出name存在重复的所有条目,sql可以这样写,可能理解不同,仅供参考
select id,name from goods WHERE name in ( SELECT name FROM goods GROUP BY name HAVING COUNT(name) > 1)
问:sql查找某一字段相同的所有数据
- 答:select *from 此表 as A join (select count(age) from 此表 group by age) B on A.age=B.age 这样按相同年龄记录分类显示出来
- 答:Select * From 数据表 Where age in ( select age From 数据表 Group By age Having Count(age )>1)
- 答:SELECT * FROM TableName WHERE age=age
亲测可以得到你想要的答案 - 答:你的问题看不懂。
1。查询某个age=15相同的数据
select * from table where age = 15
2。查询各个age相同的数据
select * from table order by age - 答:1、可以使用WHERE子句进行查询。
2、如要查询t1表中name字段为张三的所有数据,可以使用以下语句。
3、语句为:
SELECT * FROM t1 WHERE name = '张三' - 答:select * from 表名 where age = 14 这样就能查询Age为14的所有数据,不知道能否帮到你
- 答:楼主题意有些不清,去理解下来应该是找出相同age有一个以上的记录,不知道是不是这样,像这样写:
select * from 表 a where exists(select 1 from 表 b where a.id<>b.id and a.age=b.age)
问:在PL/SQL中,查找表中多条重复记录(多个字段重复,有一个字段不重复)
- 答:select A.id,A.序列号,A.名称,A.位置,A.端口,B.端口 from tb A,tb B where A.id=B.id and A.序列号=B.序列号 and A.名称=B.名称 and A.位置=B.位置;
- 答:select id,序列号,名称,位置 ,wm_concat( 端口)
from tableA
group by id,序列号,名称,位置
问:sql语句如何查询一个表中某两个字段的相同数据?
- 答:select name,id,count(*) from a group by name,id
- 答:Select Name,ID From A group by Name,ID having count (*)>1
- 答:除重
select distinct A.ID AS AID,A.Name AS AName,B.ID AS BID,B.Name AS BName from A inner join B on(A.Name=B.Name and A.ID=B.ID)
不除重
select A.ID AS AID,A.Name AS AName,B.ID AS BID,B.Name AS BName from A inner join B on(A.Name=B.Name and A.ID=B.ID) - 答:select * from A
inner join B on A.Name = B.Name and A.ID = B.ID
where A.Name = '张三' and A.ID = '008'
内连接即可
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