The Ultimate Guide to High Availability with MariaDB

DECIMAL

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Syntax

DECIMAL[(M[,D])] [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.

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

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