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如何从MySQL表显示3个随机值？

2024-04-21 23:47:03 363

使用RAND()随机的，而LIMIT3的值的数量，即在这里3-

select yourColumnName from yourTableName order by rand() limit 3;

让我们首先创建一个表-

mysql> create table DemoTable646 (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,FirstName varchar(100)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable646(FirstName) values('John');
mysql> insert into DemoTable646(FirstName) values('Bob');
mysql> insert into DemoTable646(FirstName) values('Chris');
mysql> insert into DemoTable646(FirstName) values('David');
mysql> insert into DemoTable646(FirstName) values('Bob');
mysql> insert into DemoTable646(FirstName) values('Carol');
mysql> insert into DemoTable646(FirstName) values('Mike');

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)

以下是查询以显示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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如何从MySQL表显示3个随机值？

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