如何在 MySQL 中随机排序查询结果并选择随机行?
mysqlmysqli database更新于 2024/2/4 3:45:00
要随机排序查询结果，请使用 ORDER BY RAND()。语法如下 −
select * from DemoTable1559 where yourColumnName IN(yourValue1,yourValue2,....N) order by rand() limit yourLimitValue;
首先我们创建一个表 −
mysql> create table DemoTable1559 -> ( -> EmployeeId int, -> EmployeeName varchar(20), -> EmployeeAge int -> ); Query OK, 0 rows affected (1.22 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1559 values(101,'Bob',28); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1559 values(102,'Robert',26); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1559 values(103,'Sam',25); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1559 values(104,'Mike',29); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1559 values(105,'John',34); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1559 values(106,'Carol',31); Query OK, 1 row affected (0.19 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1559;
这将产生以下输出 −
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 101 | Bob | 28 | | 102 | Robert | 26 | | 103 | Sam | 25 | | 104 | Mike | 29 | | 105 | John | 34 | | 106 | Carol | 31 | +------------+--------------+-------------+ 6 rows in set (0.00 sec)
以下是随机排序查询结果并选择随机行的查询 −
mysql> select * from DemoTable1559 where EmployeeId IN(101,103,106) order by rand() limit 3;
这将产生以下输出 −
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 101 | Bob | 28 | | 103 | Sam | 25 | | 106 | Carol | 31 | +------------+--------------+-------------+ 3 rows in set (0.00 sec)
