在 MySQL 数据库中选择两个随机行?
mysqlmysqli database
使用 RAND() 和 LIMIT 子句在 MySQL 数据库中选择两个随机行 −
select *from yourTableName order by rand() limit 2;
首先我们创建一个表 −
mysql>create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientFirstName varchar(20) ); Query OK, 0 rows affected (0.64 sec)
使用 insert 命令在表中插入一些记录 −
mysql>insert into DemoTable(ClientFirstName) values('Robert');
Query OK, 1 row affected (0.27 sec)
mysql>insert into DemoTable(ClientFirstName) values('Chris');
Query OK, 1 row affected (0.14 sec)
mysql>insert into DemoTable(ClientFirstName) values('Jace');
Query OK, 1 row affected (0.16 sec)
mysql>insert into DemoTable(ClientFirstName) values('James');
Query OK, 1 row affected (0.32 sec)
mysql>insert into DemoTable(ClientFirstName) values('David');
Query OK, 1 row affected (0.32 sec)
mysql>insert into DemoTable(ClientFirstName) values('John');
Query OK, 1 row affected (0.18 sec)
mysql>insert into DemoTable(ClientFirstName) values('Mike');
Query OK, 1 row affected (0.14 sec)
以下是使用 select 语句显示表中的所有记录的查询 −
mysql>select *from DemoTable;
这将产生以下输出 −
+----+-----------------+ | Id | ClientFirstName | +----+-----------------+ | 1 | Robert | | 2 | Chris | | 3 | Jace | | 4 | James | | 5 | David | | 6 | John | | 7 | Mike | +----+-----------------+ 7 rows in set (0.00 sec)
以下是在 MySQL 数据库中选择两行随机数据的查询。
mysql>select *from DemoTable order by rand() limit 2;
这将产生以下输出 −
+----+-----------------+ | Id | ClientFirstName | +----+-----------------+ | 4 | James | | 2 | Chris | +----+-----------------+ 2 rows in set (0.00 sec)
