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法律MySQL 從列值中隨機選擇 2 個值？
若要隨機選擇，可使用 ORDER BY RAND()。若僅選擇 2 個值，可在 MySQL 中使用 LIMIT 2。
mysql> create table DemoTable1815 ( Question text ); Query OK, 0 rows affected (0.00 sec)
首先，建立表 -
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)透過 INSERT 命令在表中插入一些記錄 -
mysql> select * from DemoTable1815;
透過 SELECT 語句在表中顯示所有記錄 -
+----------------------------+ | 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)
這會產生以下結果 -
mysql> select * from DemoTable1815 order by rand() limit 2;
透過 SELECT 語句在表中顯示所有記錄 -
+----------------------------+ | Question | +----------------------------+ | What is your college name? | | What is your enemy name? | +----------------------------+ 2 rows in set (0.00 sec)
AmitDiwan
更新於：2019-12-24
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