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Apache Spark is one of the most widely used technologies in big data analytics. In this course, you will learn how to leverage your existing SQL skills to start working with Spark immediately. You will also learn how to work with Delta Lake, a highly per
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现在有一张学生科目表course_table,这张表存储了每一位学生的id、name(姓名)、grade(年级)、course(选修课程)以及一些其他信息,现在我们想知道哪门课被学生选的人数最多? course_table表如下所示: 19 筛选出每个年级最受欢迎的三门课程 还是前面的course_table,现在我们想知道每个年级被选择最多的三门课程,该怎...
course_name, number, stu_name, grades,查询语句如下: *图片来源:网络 2.以下排序函数有哪些区别? 几个排序函数row_number() over()、rank() over()、dense_rank() over()、ntile() over()的区别 (1)row_number() over():对相等的值不进行区分,相等的值对应的排名不相同,序号从1到n连续。
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Learn how to explore what's available in a database: the tables, relationships between them, and data stored in them. Start Course for Free Included withPremium or Teams SQLExploratory Data Analysis4 hours16 videos57 Exercises4,650 XP141,405Statement of Accomplishment ...
Best SQL online course for big data analysis (Image credit: Coursera) 2. Coursera Best for big data analysis Today's Best Deals VISIT SITE Reasons to buy + Real-world examples + Useful exercises + Captions and Transcripts Reasons to avoid ...
Use cohort analysis to investigate how groups change over time Use SQL's powerful functions and operators for text analysis Detect outliers in your data and replace them with alternate values Establish causality using experiment analysis, also known as A/B testing ...