Syntax
------ 
DOUBLE[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]
DOUBLE PRECISION[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]
REAL[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]
 
Description
----------- 
A normal-size (double-precision) floating-point number (see
FLOAT for a single-precision floating-point number).
 
Allowable values are:
-1.7976931348623157E+308 to -2.2250738585072014E-308
0
2.2250738585072014E-308 to 1.7976931348623157E+308
 
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 double-precision
floating-point number is accurate to approximately 15
decimal places.
 
UNSIGNED, if specified, disallows negative values.
 
ZEROFILL, if specified, pads the number with zeros, up to
the total number
of digits specified by M.
 
REAL and DOUBLE PRECISION are synonyms, unless the
REAL_AS_FLOAT SQL mode is enabled, in which case REAL is a
synonym for FLOAT rather than DOUBLE.
 
See Floating Point Accuracy for issues when using
floating-point numbers.
 
For more details on the attributes, see Numeric Data Type
Overview.
 
Examples
-------- 
CREATE TABLE t1 (d DOUBLE(5,0) zerofill);
 
INSERT INTO t1 VALUES (1),(2),(3),(4);
 
SELECT * FROM t1;
 
+-------+
| d |
+-------+
| 00001 |
| 00002 |
| 00003 |
| 00004 |
+-------+
 

 
 
 
 
 
 
 

URL: https://mariadb.com/kb/en/double/