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)