如何显示 MySQL 表中的 3 个随机值?
mysqlmysqli database更新于 2025/10/18 21:32:17
使用 RAND() 进行随机，而 LIMIT 3 则用于值的数量，即此处的 3 −
select yourColumnName from yourTableName order by rand() limit 3;
首先我们创建一个表 −
mysql> create table DemoTable646 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,FirstName varchar(100) ); Query OK, 0 rows affected (0.76 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable646(FirstName) values('John');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable646(FirstName) values('Bob');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable646(FirstName) values('Chris');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable646(FirstName) values('David');
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable646(FirstName) values('Bob');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable646(FirstName) values('Carol');
Query OK, 1 row affected (0.27 sec)
mysql> insert into DemoTable646(FirstName) values('Mike');
Query OK, 1 row affected (0.10 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable646;
这将产生以下输出 −
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 2 | Bob | | 3 | Chris | | 4 | David | | 5 | Bob | | 6 | Carol | | 7 | Mike | +----+-----------+ 7 rows in set (0.00 sec)
以下查询显示 MySQL 表中的 3 个随机值 −
mysql> select FirstName from DemoTable646 order by rand() limit 3;
这将产生以下输出 −
+-----------+ | FirstName | +-----------+ | Mike | | John | | Chris | +-----------+ 3 rows in set (0.00 sec)
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