MySQL从列值中随机选择2个值?
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
);
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable1815 values('What is your name?');mysql> insert into DemoTable1815 values('What is your college name?');
mysql> insert into DemoTable1815 values('What is your nick name?');
mysql> insert into DemoTable1815 values('What is your enemy name?');
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)
这是只随机选择2条记录的查询-
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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