The Float datatype in MySQL is inherently inaccurate. If you are planning to use a float datatype for a column in your database you should reconsider, especially if you are planning to use it to store money values. Here is an example of the problem.
Sort Text Column Numerically in MySQL
Normally when you want to sort numerically on a column in your database you’d make the column some sort of numeric type such as an int. Sometimes, however, you are stuck with someone else’s schema and they have decided to store numbers in a text type column and you need to sort your results numerically […]