Just For My Daily Diary
Just For My Daily Diary
Welcome to the Data Cleaning course on Kaggle Learn! 欢迎来到 Kaggle Learn 上的数据清理课程！ Data cleaning is a key part of data science, but it can be deeply frustrating. Why are some of your text fields garbled? What should you do about those missing values? Why aren’t your dates formatted correctly? How can you quickly clean […]
This notebook is an exercise in the SQL course. You can reference the tutorial at this link. Introduction 介绍 Stack Overflow is a widely beloved question and answer site for technical questions. You’ll probably use it yourself as you keep using SQL (or any programming language). Stack Overflow 是一个广受欢迎的技术问题问答网站。 当您继续使用 SQL（或任何编程语言）时，您可能会使用它。 Their data is publicly […]
Introduction 介绍 You have the tools to obtain data from a single table in whatever format you want it. But what if the data you want is spread across multiple tables? 您可以使用工具以您想要的任何格式从单个表中获取数据。 但是，如果您想要的数据分布在多个表中怎么办？ That’s where JOIN comes in! JOIN is incredibly important in practical SQL workflows. So let’s get started. 这就是 JOIN 发挥作用的地方！ JOIN 在实际 […]