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从具有重复值的表中选择MySQL中出现次数最高的条目？

2024-05-19 00:16:04 400

让我们首先创建一个表-

create table DemoTable610 (SubjectName varchar(100));

使用插入命令在表中插入一些记录-

insert into DemoTable610 values('MySQL');
insert into DemoTable610 values('Java');
insert into DemoTable610 values('MySQL');
insert into DemoTable610 values('MongoDB');
insert into DemoTable610 values('MySQL');
insert into DemoTable610 values('MySQL');
insert into DemoTable610 values('Java');
insert into DemoTable610 values('MongoDB');
insert into DemoTable610 values('C');
insert into DemoTable610 values('C++');
insert into DemoTable610 values('MongoDB');
insert into DemoTable610 values('MySQL');
insert into DemoTable610 values('Java');
insert into DemoTable610 values('Python');
insert into DemoTable610 values('MySQL');

使用select语句显示表中的所有记录-

select *from DemoTable610;

这将产生以下输出-

+-------------+
| SubjectName |
+-------------+
| MySQL       |
| Java        |
| MySQL       |
| MongoDB     |
| MySQL       |
| MySQL       |
| Java        |
| MongoDB     |
| C           |
| C++         |
| MongoDB     |
| MySQL       |
| Java        |
| Python      |
| MySQL       |
+-------------+
15 rows in set (0.00 sec)

这是仅选择出现次数最高的条目的查询-

select SubjectName from ( select SubjectName from DemoTable610 group by SubjectName order by count(SubjectName) DESC LIMIT 2 ) AS tbl order by SubjectName;

这将产生以下输出-

+-------------+
| SubjectName |
+-------------+
| Java        |
| MySQL       |
+-------------+
2 rows in set (0.04 sec)

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从具有重复值的表中选择MySQL中出现次数最高的条目？

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