极客教程如何在MySQL中检索随机行或多个随机行？
您可以使用RAND()方法来实现这一点。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。创建表的查询语句如下。
mysql> create table gettingRandomRow
-> (
-> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> CustomerName varchar(100)
-> );
Query OK, 0 rows affected (0.45 sec)
使用插入命令在表中插入一些记录。查询如下所示。
mysql> insert into gettingRandomRow(CustomerName) values('Chris');
Query OK, 1 row affected (0.14 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Robert');
Query OK, 1 row affected (0.10 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Ramit');
Query OK, 1 row affected (0.15 sec)
mysql> insert into gettingRandomRow(CustomerName) values('James');
Query OK, 1 row affected (0.11 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Jace');
Query OK, 1 row affected (0.12 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Mike');
Query OK, 1 row affected (0.15 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Sam');
Query OK, 1 row affected (0.17 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Carol');
Query OK, 1 row affected (0.11 sec)
mysql> insert into gettingRandomRow(CustomerName) values('David');
Query OK, 1 row affected (0.16 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Maxwell');
Query OK, 1 row affected (0.14 sec)
mysql> insert into gettingRandomRow(CustomerName) values('Larry');
Query OK, 1 row affected (0.13 sec)
mysql> insert into gettingRandomRow(CustomerName) values('John');
Query OK, 1 row affected (0.11 sec)
使用select语句显示表中的所有记录。查询如下所示。
mysql> select *from gettingRandomRow;
以下是输出结果。
+------------+--------------+
| 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)
以下是检索随机行或多个随机行的查询。
情况1 ：查询如下所示-
mysql> select *from gettingRandomRow order by rand() LIMIT 1;
以下是输出结果。
+------------+--------------+
| CustomerId | CustomerName |
+------------+--------------+
| 13 | John |
+------------+--------------+
1 row in set (0.00 sec)
情况2 ：查询如下所示-
mysql> select *from gettingRandomRow order by rand() LIMIT 2;
以下是输出结果。
+------------+--------------+
| CustomerId | CustomerName |
+------------+--------------+
| 2 | Robert |
| 3 | Ramit |
+------------+--------------+
2 rows in set (0.00 sec)
情况3 ：查询如下所示-
mysql> select *from gettingRandomRow order by rand() LIMIT 2;
以下是输出结果。
+------------+--------------+
| CustomerId | CustomerName |
+------------+--------------+
| 4 | James |
| 9 | Carol |
+------------+--------------+
2 rows in set (0.00 sec)
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