MySQL 分组并显示在列表中

为此，请使用GROUP BY和ORDER BY –

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)
−> );
Query OK, 0 rows affected (1.22 sec)

使用插入命令将一些记录插入表中 –

mysql> insert into demo7(first_name) values('John');
Query OK, 1 row affected (0.09 sec)
mysql> insert into demo7(first_name) values('David');
Query OK, 1 row affected (0.22 sec)
mysql> insert into demo7(first_name) values('John');
Query OK, 1 row affected (0.07 sec)
mysql> insert into demo7(first_name) values('Bob');
Query OK, 1 row affected (0.27 sec)
mysql> insert into demo7(first_name) values('David');
Query OK, 1 row affected (0.11 sec)
mysql> insert into demo7(first_name) values('David');
Query OK, 1 row affected (0.09 sec)
mysql> insert into demo7(first_name) values('John');
Query OK, 1 row affected (0.26 sec)
mysql> insert into demo7(first_name) values('John');
Query OK, 1 row affected (0.09 sec)

使用select语句显示表中的记录 –

mysql> select *from demo7;

这将产生以下结果 –

+----+--------------+
| 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)

以下是在MySQL中分组结果并在列表中显示的查询 –

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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