(mysql.info) number-syntax
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9.1.2 Numbers
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Integers are represented as a sequence of digits. Floats use ‘`.'’
as a decimal separator. Either type of number may be preceded by
‘`-'’ or ‘`+'’ to indicate a negative or positive value,
respectively
Examples of valid integers:
1221
0
-32
Examples of valid floating-point numbers:
294.42
-32032.6809e+10
148.00
An integer may be used in a floating-point context; it is interpreted
as the equivalent floating-point number.
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