位运算的简介与实例（Mysql）

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什么是位运算？

程序中的所有数在计算机内存中都是以二进制的形式储存的。位运算就是直接对整数在内存中的二进制位进行操作。

下面是维基百科对于位运算的简要解释：

In digital computer programming, a bitwise operation operates on one or more bit patterns or binary numerals at the level of their individual bits. It is a fast, simple action directly supported by the processor, and is used to manipulate values for comparisons and calculations.
On simple low-cost processors, typically, bitwise operations are substantially faster than division, several times faster than multiplication, and sometimes significantly faster than addition. While modern processors usually perform addition and multiplication just as fast as bitwise operations due to their longer instruction pipelines and other architectural design choices, bitwise operations do commonly use less power because of the reduced use of resources.

在数字技术算计编程中，一个位运算操作的是一个或多个位组合或者是二进制数字，并且这些操作都是在单个位级别上的。
位运算是直接运行在处理器上的，因此非常简单而快速，常常用于比较或计算数据。
在简易的低成本处理器上，位