覆盖索引又称为索引覆盖，即 select 的数据列只从索引中就能得到，不必读取数据行，也就是只需扫描索引就可以得到查询结果。

前面的笔记已经分别介绍了硅光调制器的几种电学结构，包括载流子耗尽型硅基调制器，载流子积累型硅基调制器和载流子注入型硅光调制器。这篇笔记整理下硅光调制器的常见光学结构。...

Improving Metagenomic Classification using Discriminative k-mers from Sequencing Data

Godot提供了许多碰撞对象以提供碰撞检测和响应。试图确定要为您的项目使用哪个选项可能会造成混淆。如果您了解每个问题的工作原理和优点和缺点，则可以避免这些问题并简化开发。在本教程中，我们将查看 Area2D节点并显示...

饼图把一个圆分成多个部分，这些部分的弧长（以及面积）代表一个整体的比例。月亮图也是如此，它把一个圆分成多个部分，这些部分的面积代表整个圆的比例，但在月亮图中，这些部分被画成圆的月牙形，就像月相。...

Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything.

Sort a linked list in O(n log n) time using constant space complexity.

Given a non-empty array of integers, every element appears twice except for one. Find that single one.

Given a non-empty array of integers, every element appears three times except for one, which appears exactly once. Find that single one.

Given a linked list, determine if it has a cycle in it.