sql-92 includes a decimal data type, which is an exact numeric type for representing fixed point decimal numbers and performs basic arithmetic operation on decimal numbers.
explicit numeric conversion is used to convert any numeric type to any other numeric type, for which there is no implicit conversion, by using a cast expression.
显式数值转换用于通过显式转换表达式,将任何数字类型转换为任何其他数字类型。对于它不存在隐式转换。
longrangevalidator: component's local value must be numeric type and convertible to long; must be in range specified by minimum and/or maximum values.