Syntax
------ 
DECIMAL[(M[,D])] [SIGNED | UNSIGNED | ZEROFILL]
 
Description
----------- 
A packed "exact" fixed-point number. M is the total number
of digits (the
precision) and D is the number of digits after the decimal
point (the
scale). The decimal point and (for negative numbers) the
"-" sign are not
counted in M. If D is 0, values have no decimal point or
fractional
part and on INSERT the value will be rounded to the nearest
DECIMAL. The maximum number of digits (M) for DECIMAL is 65.
The maximum number of supported decimals (D) is 30 before
MariadB 10.2.1 and 38 afterwards. If D is omitted, the
default is 0. If M is omitted, the default is 10.
 
UNSIGNED, if specified, disallows negative values.
 
ZEROFILL, if specified, pads the number with zeros, up to
the total number
of digits specified by M.
 
All basic calculations (+, -, *, /) with DECIMAL columns are
done with
a precision of 65 digits.
 
For more details on the attributes, see Numeric Data Type
Overview.
 
Oracle Mode
 
In Oracle mode from MariaDB 10.3, NUMBER is a synonym.
 
Examples
-------- 
CREATE TABLE t1 (d DECIMAL UNSIGNED ZEROFILL);
 
INSERT INTO t1 VALUES (1),(2),(3),(4.0),(5.2),(5.7);
Query OK, 6 rows affected, 2 warnings (0.16 sec)
Records: 6 Duplicates: 0 Warnings: 2
 
Note (Code 1265): Data truncated for column 'd' at row 5
Note (Code 1265): Data truncated for column 'd' at row 6
 
SELECT * FROM t1;
 
+------------+
| d |
+------------+
| 0000000001 |
| 0000000002 |
| 0000000003 |
| 0000000004 |
| 0000000005 |
| 0000000006 |
+------------+
 
INSERT INTO t1 VALUES (-7);
ERROR 1264 (22003): Out of range value for column 'd' at
row 1
 


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