MySQL 从列值中随机选择 2 个值?
mysqlmysqli database更新于 2024/10/9 18:52:17
要随机选择，请使用 ORDER BY RAND()。要仅选择 2 个值，请在 MySQL 中使用 LIMIT 2。让我们首先创建一个表 −
mysql> create table DemoTable1815 ( Question text ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1815 values('What is your name?');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1815 values('What is your college name?');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1815 values('What is your nick name?');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1815 values('What is your enemy name?');
Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1815;
这将产生以下输出 −
+----------------------------+ | Question | +----------------------------+ | What is your name? | | What is your college name? | | What is your nick name? | | What is your enemy name? | +----------------------------+ 4 rows in set (0.00 sec)
以下查询仅随机选择 2 条记录 −
mysql> select * from DemoTable1815 order by rand() limit 2;
这将产生以下输出 −
+----------------------------+ | Question | +----------------------------+ | What is your college name? | | What is your enemy name? | +----------------------------+ 2 rows in set (0.00 sec)
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mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
