## Topic

FLOAT[(M,D)] [UNSIGNED] [ZEROFILL]

A small (single-precision) floating-point number. Permissible values

are -3.402823466E+38 to -1.175494351E-38, 0, and 1.175494351E-38 to

3.402823466E+38. These are the theoretical limits, based on the IEEE

standard. The actual range might be slightly smaller depending on your

hardware or operating system.

M is the total number of digits and D is the number of digits following

the decimal point. If M and D are omitted, values are stored to the

limits permitted by the hardware. A single-precision floating-point

number is accurate to approximately 7 decimal places.

FLOAT(M,D) is a nonstandard MySQL extension. As of MySQL 8.0.17, this

syntax is deprecated and support for it will be removed in a future

MySQL version.

UNSIGNED, if specified, disallows negative values. As of MySQL 8.0.17,

the UNSIGNED attribute is deprecated for columns of type FLOAT (and any

synonyms) and support for it will be removed in a future MySQL version.

Consider using a simple CHECK constraint instead for such columns.

Using FLOAT might give you some unexpected problems because all

calculations in MySQL are done with double precision.

## Example