(mysql.info) number-syntax

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(mysql.info) string-syntax

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 9.1.2 Numbers
 -------------
 
 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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(mysql.info) string-syntax

(mysql.info) literals

(mysql.info) hexadecimal-values