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Legal Studies顯示來自 MySQL 表的隨機行
要顯示單個隨機行，使用 RAND() 和 LIMIT。此處使用 LIMIT 獲取記錄數，因為我們只想要單個行，因此使用 LIMIT 1。我們先建立一個表 -
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(50), Quote text ); Query OK, 0 rows affected (0.71 sec)
使用 insert 命令插入一些記錄到表中 -
mysql> insert into DemoTable(Name,Quote) values('Chris','MySQL is a relational database');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(Name,Quote) values('Robert','Java is an Object Oriented Programming Language');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name,Quote) values('Mike','C is a Procedural Language');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(Name,Quote) values('David','Hibernate and spring is a framework');
Query OK, 1 row affected (0.15 sec)使用 select 語句顯示錶中的所有記錄 -
mysql> select *from DemoTable;
這將生成以下輸出 -
+----+--------+-------------------------------------------------+ | Id | Name | Quote | +----+--------+-------------------------------------------------+ | 1 | Chris | MySQL is a relational database | | 2 | Robert | Java is an Object Oriented Programming Language | | 3 | Mike | C is a Procedural Language | | 4 | David | Hibernate and spring is a framework | +----+--------+-------------------------------------------------+ 4 rows in set (0.00 sec)
以下是顯示 MySQL 表中隨機行的查詢 -
mysql> select Id,Name,Quote from DemoTable order by rand() limit 1;
這將生成以下輸出 -
+----+------+----------------------------+ | Id | Name | Quote | +----+------+----------------------------+ | 3 | Mike | C is a Procedural Language | +----+------+----------------------------+ 1 row in set (0.00 sec)
更新於: 03-Oct-2019
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