MySQL：Select语句并有选择地检索数据

Question

I have a large dataset in MySQL and I would like to speed up the select statement when reading data. Assuming that there are 1000 records, I would like to issue a select statement that retrieves half of them for example but based on time-stamp.

Using something like this will not work, while id is not tightly coupled with time-stamp

select * from table where table.id mod 5 = 0;

Retrieving all the data and afterwards select the data needed is not a solution while I want to avoid retrieving the large dataset. Thus, I 'm looking for something that would distinguish the records upon select.

Thnx

Answer 1

If you need speed then try this

select * from table ORDER BY table.id DESC LIMIT 0,500;

select * from table ORDER BY table.id DESC LIMIT 500,500;

and so on...