随机读取数据库记录
MySql中随机提取数据库N条记录

select * from TableName order by rand() limit N

SQLServer中随机提取数据库N条记录

select top N * from TableName order by NEWID()

Access中随机提取数据库N条记录

SELECT top N * FROM TableName ORDER BY Rnd(Id)

注：Id:为你当前表的唯一ID字段名