DECIMAL[(M[,D])] [SIGNED | UNSIGNED | ZEROFILL]

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.

In Oracle mode from MariaDB 10.3, `NUMBER`

is a synonym.

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

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