
Identifiers and Reserved Words in SQL  Lexical Elements of the SQL Language  Character and Binary strings 
Numbers in SQL are entered in the normal manner. A number notation may begin with a decimal separator, and is interpreted as "zero point ...".
Example integer numbers: 0, 123456789, 987654321, +456
Example real numbers: 123.456, 123.456, .555
Example semilogarithmic notation: 123.456e78, 123.456e78, 1e12,
Identifiers and Reserved Words in SQL  Lexical Elements of the SQL Language  Character and Binary strings 