如何从MySQL数据库中选择前10个元素？

使用带有LIMIT 10的SQL ORDER BY子句从数据库选择前10个元素。

语法如下：

SELECT * FROM yourTableName ORDER BY yourIdColumnName LIMIT 10;

为了理解上面的语法，让我们创建一个表。创建表的查询如下所示：

mysql> create table Clients
   -> (
   -> Client_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> ClientName varchar(20)
   -> );
Query OK, 0 rows affected (0.51 sec)

使用insert命令在表中插入一些记录。

查询如下所示：

mysql> insert into Clients(ClientName) values('Larry');
Query OK, 1 row affected (0.09 sec)
mysql> insert into Clients(ClientName) values('Sam');
Query OK, 1 row affected (0.19 sec)
mysql> insert into Clients(ClientName) values('Bob');
Query OK, 1 row affected (0.18 sec)
mysql> insert into Clients(ClientName) values('David');
Query OK, 1 row affected (0.15 sec)
mysql> insert into Clients(ClientName) values('John');
Query OK, 1 row affected (0.17 sec)
mysql> insert into Clients(ClientName) values('James');
Query OK, 1 row affected (0.14 sec)
mysql> insert into Clients(ClientName) values('Robert');
Query OK, 1 row affected (0.11 sec)
mysql> insert into Clients(ClientName) values('Carol');
Query OK, 1 row affected (0.15 sec)
mysql> insert into Clients(ClientName) values('Mike');
Query OK, 1 row affected (0.12 sec)
mysql> insert into Clients(ClientName) values('Maxwell');
Query OK, 1 row affected (0.27 sec)
mysql> insert into Clients(ClientName) values('Chris');
Query OK, 1 row affected (0.23 sec)
mysql> insert into Clients(ClientName) values('Ramit');
Query OK, 1 row affected (0.18 sec)

使用select语句从表中显示所有记录。

查询如下所示：

mysql> select *from Clients;

如下是输出结果：

+-----------+------------+
| Client_Id | ClientName |
+-----------+------------+
|         1 | Larry      |
|         2 | Sam        |
|         3 | Bob        |
|         4 | David      |
|         5 | John       |
|         6 | James      |
|         7 | Robert     |
|         8 | Carol      |
|         9 | Mike       |
|        10 | Maxwell    |
|        11 | Chris      |
|        12 | Ramit      |
+-----------+------------+
12 rows in set (0.00 sec)

以下是选择前10个元素的查询语句：

mysql> select *from Clients ORDER BY Client_Id LIMIT 10;

如下是输出结果：

+-----------+------------+
| Client_Id | ClientName |
+-----------+------------+
|         1 | Larry      |
|         2 | Sam        |
|         3 | Bob        |
|         4 | David      |
|         5 | John       |
|         6 | James      |
|         7 | Robert     |
|         8 | Carol      |
|         9 | Mike       |
|        10 | Maxwell    |
+-----------+------------+
10 rows in set (0.00 sec)

以下是选择前10个元素的其他查询语句。

查询如下所示：

mysql> select *from Clients limit 0,10;

如下是输出结果：

+-----------+------------+
| Client_Id | ClientName |
+-----------+------------+
|         1 | Larry      |
|         2 | Sam        |
|         3 | Bob        |
|         4 | David      |
|         5| John       |
|         6 | James      |
|         7 | Robert     |
|         8 | Carol      |
|         9 | Mike       |
|        10 | Maxwell    |
+-----------+------------+
10 rows in set (0.00 sec)

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