From integer data types , units are assumed to be in monetary units 如果将整型数据类型转换为
Signed integral data types are “有符号”整型数据类型有
Must be an integral data type 必须为整型数据类型。
You can declare the underlying type of an enumeration to be any integral data type 可以将枚举的基础类型声明为任何整型数据类型(
Integral data types are those that represent only numbers without fractional parts . the “整型数据类型”是只表示整数(没有小数部分)的数据类型。
You may assume that the operands and the result are within the range of value of the int type 你要确保输入的操作数要在整型数据类型所能表示的范围之内。
For variables that never contain fractions , the integral data types are more efficient than the nonintegral types 对于从不包含小数的变量,整型数据类型比非整型的效率高。
Are those that represent numbers with both integer and fractional parts . the nonintegral numeric data types are decimal “非整型数据类型”是表示同时带有整数部分和小数部分的数字的类型。
For example , you might change the data type of a column that contains only integer data to a numeric data type , such as dt i2 例如,可以将只包含整型数据的列的数据类型更改为数值数据类型,例如dt _ i2 。