What is the precision value of float
The FLOAT data type is used to store a single or double precision floating point number.
If a column with the FLOAT data type ( precision ) is created, it is guaranteed that the columns on all platforms save the values at least up to the specified minimum total digits. With REAL and DOUBLE, however, no platform-independent minimum total number of digits is guaranteed.
If precision is not specified, the FLOAT data type is a single-precision floating point number, equivalent to the REAL data type, and requires 4 bytes of storage space.
If precision is specified, the FLOAT data type is either single-precision or double-precision, depending on the total number of digits value. The difference between REAL and DOUBLE depends on the platform. Single-precision FLOAT values require 4 bytes of storage space and double-precision FLOAT values require 8 bytes.
The FLOAT data type is an approximate numeric data type. Rounding errors can occur after arithmetic operations. Because FLOAT values are approximate, queries that use equality should generally be avoided when comparing FLOAT values.
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