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使用MySQL从表中获取随机行

2024-05-14 02:12:04 476

为此，您可以使用PREPARE语句。让我们首先创建一个表-

mysql> create table DemoTable(
   FirstName varchar(100),
   CountryName varchar(100)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('Adam','US');
mysql> insert into DemoTable values('Chris','AUS');
mysql> insert into DemoTable values('Robert','UK');

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+-----------+-------------+
| FirstName | CountryName |
+-----------+-------------+
| Adam      | US          |
| Chris     | AUS         |
| Robert    | UK          | 
+-----------+-------------+
3 rows in set (0.00 sec)

以下是在单个查询中获取随机行的查询-

mysql> set @value := ROUND((select count(*) from DemoTable) * rand());
mysql> set @query := CONCAT('select *from DemoTable LIMIT ', @value , ', 1');
mysql> prepare myStatement from @query ;
Statement prepared
mysql> execute myStatement;
+-----------+-------------+
| FirstName | CountryName |
+-----------+-------------+
| Chris     | AUS         |
+-----------+-------------+
1 row in set (0.00 sec)
mysql> deallocate prepare myStatement;

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使用MySQL从表中获取随机行

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