数值语法
以下语法用于 ODBC 中的数字文本:
numeric-literal ::= signed-numeric-literal | unsigned-numeric-literal
signed-numeric-literal ::= [sign] unsigned-numeric-literal
unsigned-numeric-literal ::= exact-numeric-literal | approximate-numeric-literal
exact-numeric-literal ::= unsigned-integer [period[unsigned-integer]] |period unsigned-integer
sign ::= plus-sign | minus-sign
approximate-numeric-literal ::= mantissa E 指数
mantissa ::= exact-numeric-literal
exponent ::= signed-integer
signed-integer ::= [sign] unsigned-integer
unsigned-integer ::= digit...
加号 ::= +
减号 ::= -
digit ::= 1 |2 |3 |4 |5 |6 |7 |8 |9 |0
period ::= 。