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法律MySQL 从列值中随机选择 2 个值？
若要随机选择，可使用 ORDER BY RAND()。若仅选择 2 个值，可在 MySQL 中使用 LIMIT 2。
mysql> create table DemoTable1815 ( Question text ); Query OK, 0 rows affected (0.00 sec)
首先，创建表 -
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)通过 INSERT 命令在表中插入一些记录 -
mysql> select * from DemoTable1815;
通过 SELECT 语句在表中显示所有记录 -
+----------------------------+ | 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)
这会产生以下结果 -
mysql> select * from DemoTable1815 order by rand() limit 2;
通过 SELECT 语句在表中显示所有记录 -
+----------------------------+ | Question | +----------------------------+ | What is your college name? | | What is your enemy name? | +----------------------------+ 2 rows in set (0.00 sec)
AmitDiwan
更新于：2019-12-24
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