how to get nearest value from database in mysql

Question

I am using mySQL and CodeIgniter. I have some floating point numbers in my database such as

• 8.3456
• 8.5555
• 4.5556

Answer 1

Assuming that you have a 10% tolerance (+/-) you could try something like:

select * from table 
where value >= ($myvalue * .9) and value <= ($myvalue * 1.1) 
order by abs(value - $myvalue) limit 1

Slightly updated stealing from others - this should return the nearest result in the assumed tolerance range. (Also, I just noticed the where was incorrect, apologies - now it should work).