如何从MySQL数据库中选择前10个元素？
使用带有LIMIT10的SQLORDERBY子句从数据库中选择前10个元素。
语法如下
SELECT *FROM yourTableName ORDER BY yourIdColumnName LIMIT 10;
为了理解上述语法，让我们创建一个表。创建表的查询如下
mysql> create table Clients - > ( - > Client_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > ClientName varchar(20) - > );
使用insert命令在表中插入一些记录。
查询如下
mysql> insert into Clients(ClientName) values('Larry');
mysql> insert into Clients(ClientName) values('Sam');
mysql> insert into Clients(ClientName) values('Bob');
mysql> insert into Clients(ClientName) values('David');
mysql> insert into Clients(ClientName) values('John');
mysql> insert into Clients(ClientName) values('James');
mysql> insert into Clients(ClientName) values('Robert');
mysql> insert into Clients(ClientName) values('Carol');
mysql> insert into Clients(ClientName) values('Mike');
mysql> insert into Clients(ClientName) values('Maxwell');
mysql> insert into Clients(ClientName) values('Chris');
mysql> insert into Clients(ClientName) values('Ramit');使用select语句显示表中的所有记录。
查询如下
mysql> select *from Clients;
以下是输出
+-----------+------------+ | 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)
这是选择前10个元素的查询
mysql> select *from Clients ORDER BY Client_Id LIMIT 10;
以下是输出
+-----------+------------+ | 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)
这是选择前10个元素的替代查询。
查询如下
mysql> select *from Clients limit 0,10;
以下是输出
+-----------+------------+ | 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)