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用MySQL改组列值？

2024-04-27 00:50:07 341

要随机播放元素，您需要使用ORDERBYRAND()。让我们首先创建一个表-

mysql> create table DemoTable1557
   -> (
   -> SubjectId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> SubjectName varchar(20)
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1557(SubjectName) values('MySQL');
mysql> insert into DemoTable1557(SubjectName) values('MongoDB');
mysql> insert into DemoTable1557(SubjectName) values('Java');
mysql> insert into DemoTable1557(SubjectName) values('C');

使用选择显示表中的所有记录-

mysql> select * from DemoTable1557;

这将产生以下输出-

+-----------+-------------+
| SubjectId | SubjectName |
+-----------+-------------+
|         1 | MySQL       |
|         2 | MongoDB     |
|         3 | Java        |
|         4 | C           |
+-----------+-------------+
4 rows in set (0.00 sec)

以下是使用MySQL随机整理记录的查询-

mysql> select * from DemoTable1557 order by rand();

这将产生以下输出-

+-----------+-------------+
| SubjectId | SubjectName |
+-----------+-------------+
|         1 | MySQL       |
|         3 | Java        |
|         2 | MongoDB     |
|         4 | C           |
+-----------+-------------+
4 rows in set (0.00 sec)

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用MySQL改组列值？

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