Numeric literals are written as a sequence of digits from
9. Initial zeros are ignored. A sign can always precede the digits, but it is optional for positive numbers. In decimal numbers, the integer part and the decimal part are divided with a dot (
If the integer part is zero, it can be omitted, but the literal must begin with a dot.
The notation with exponent can be used. The exponent is preceded by an
e character. The exponent can be preceded by a sign and must be an integer. A number
N with an exponent part
X, is calculated as
N * POW(10, X).
In some cases, adding zeroes at the end of a decimal number can increment the precision of the expression where the number is used. For example,
PI() by default returns a number with 6 decimal digits. But the
PI()+0.0000000000 expression (with 10 zeroes) returns a number with 10 decimal digits.
Hexadecimal literals are interpreted as numbers when used in numeric contexts.
10 +10 -10
All these literals are equivalent:
0.1 .1 +0.1 +.1
0.2E3 -- 0.2 * POW(10, 3) = 200 .2e3 .2e+2 1.1e-10 -- 0.00000000011 -1.1e10 -- -11000000000
© 2019 MariaDB
Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.