如何在MySQL中检索随机行或多个随机行？

2024-04-27 19:43:06 219

您可以RAND()为此使用方法。要检索随机行，请使用以下语法

SELECT *FROM yourTableName ORDER BY RAND() LIMIT yourIntegerNumber;

为了理解上述语法，让我们创建一个表。创建表的查询如下

mysql> create table gettingRandomRow
   -> (
   -> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> CustomerName varchar(100)
   -> );

使用insert命令在表中插入一些记录。查询如下-

mysql> insert into gettingRandomRow(CustomerName) values('Chris');
mysql> insert into gettingRandomRow(CustomerName) values('Robert');
mysql> insert into gettingRandomRow(CustomerName) values('Ramit');
mysql> insert into gettingRandomRow(CustomerName) values('James');
mysql> insert into gettingRandomRow(CustomerName) values('Jace');
mysql> insert into gettingRandomRow(CustomerName) values('Mike');
mysql> insert into gettingRandomRow(CustomerName) values('Sam');
mysql> insert into gettingRandomRow(CustomerName) values('Bob');
mysql> insert into gettingRandomRow(CustomerName) values('Carol');
mysql> insert into gettingRandomRow(CustomerName) values('David');
mysql> insert into gettingRandomRow(CustomerName) values('Maxwell');
mysql> insert into gettingRandomRow(CustomerName) values('Larry');
mysql> insert into gettingRandomRow(CustomerName) values('John');

使用select语句显示表中的所有记录。查询如下-

mysql> select *from gettingRandomRow;

以下是输出

+------------+--------------+
| CustomerId | CustomerName |
+------------+--------------+
|          1 | Chris        |
|          2 | Robert       |
|          3 | Ramit        |
|          4 | James        |
|          5 | Jace         |
|          6 | Mike         |
|          7 | Sam          |
|          8 | Bob          |
|          9 | Carol        |
|         10 | David        |
|         11 | Maxwell      |
|         12 | Larry        |
|         13 | John         |
+------------+--------------+
13 rows in set (0.00 sec)

这是获取一个随机行或多个随机行的查询。

情况1：查询如下-

mysql> select *from gettingRandomRow order by rand() LIMIT 1;

以下是输出

+------------+--------------+
| CustomerId | CustomerName |
+------------+--------------+
|         13 | John         |
+------------+--------------+
1 row in set (0.00 sec)

情况2：查询如下-

mysql> select *from gettingRandomRow order by rand() LIMIT 2;

以下是输出

+------------+--------------+
| CustomerId | CustomerName |
+------------+--------------+
|          2 | Robert       |
|          3 | Ramit        |
+------------+--------------+
2 rows in set (0.00 sec)

情况3：查询如下-

mysql> select *from gettingRandomRow order by rand() LIMIT 2;

以下是输出

+------------+--------------+
| CustomerId | CustomerName |
+------------+--------------+
|          4 | James        |
|         9 | Carol         |
+------------+--------------+
2 rows in set (0.00 sec)

如何在MySQL中检索随机行或多个随机行？

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