FLOAT[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]
A small (single-precision) floating-point number (see DOUBLE for a regular-size floating point number). Allowable values are:
- -3.402823466E+38 to -1.175494351E-38
- 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 allowed by the hardware. A single-precision floating-point number is accurate to approximately 7 decimal places.
UNSIGNED, if specified, disallows negative values.
Using FLOAT might give you some unexpected problems because all calculations in MariaDB are done with double precision. See Floating Point Accuracy.
For more details on the attributes, see Numeric Data Type Overview.