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在MySQL中将结果分组并显示在列表中？

2024-04-20 14:00:03 443

为此，请结合使用GROUPBY和ORDERBY-

select yourColumnName,count(*) as anyAliasName from yourTableName group by yourColumnName order by yourColumnName;

让我们创建一个表-

mysql> create table demo7
−> (
−> id int NOT NULL AUTO_INCREMENT,
−> first_name varchar(50)
−> ,
−> primary key(id)
−> );

借助insert命令将一些记录插入表中-

mysql> insert into demo7(first_name) values('John');
mysql> insert into demo7(first_name) values('David');
mysql> insert into demo7(first_name) values('John');
mysql> insert into demo7(first_name) values('Bob');
mysql> insert into demo7(first_name) values('David');
mysql> insert into demo7(first_name) values('David');
mysql> insert into demo7(first_name) values('John');
mysql> insert into demo7(first_name) values('John');

使用select语句显示表中的记录-

mysql> select *from demo7;

这将产生以下输出-

+----+------------+
| id | first_name |
+----+------------+
|  1 | John       |
|  2 | David      |
|  3 | John       |
|  4 | Bob        |
|  5 | David      |
|  6 | David      |
|  7 | John       |
|  8 | John       |
+----+------------+
8 rows in set (0.00 sec)

以下是将结果分组到MySQL并显示在列表中的查询-

mysql> select first_name,count(*) as frequency from demo7 group by first_name order by first_name;

这将产生以下输出-

+------------+-----------+
| first_name | frequency |
+------------+-----------+
| Bob        |         1 |
| David      |         3 |
| John       |         4 |
+------------+-----------+
3 rows in set (0.00 sec)

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在MySQL中将结果分组并显示在列表中？

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