Question

I am wondering what data type I should use for storing 11.1234 in mySql?

I am not sure if I should use varchar or int. There is also some decimal data types.

Answer 1

FLOAT or DECIMAL is probably best.

From the MySQL manual:

The FLOAT and DOUBLE data types are
used to represent approximate numeric
data values […] The DECIMAL and
NUMERIC data types are used to store
exact numeric data values. In MySQL,
NUMERIC is implemented as DECIMAL.
These types are used to store values
for which it is important to preserve
exact precision, for example with
monetary data.