Learn SQL - Part I

了解SQL第一部分 - 教程初学者

+ Get more of what you want with SQL: 



+ Creating and dropping tables

+ Basic queries: SFW statement

+ Example: reading a table

+ Example: selection and projection

+ Example: join, Example: rename

+ A more complicated example

+ Set versus bag semantics, A case for bag semantics

+ SQL set and bag operations, SQL features covered so far

+ IN subqueries, Semantics of subqueries

+ Scoping rule of subqueries, Examples of quantified subqueries

+ More ways to get the most popular

+ SQL features covered so far, Aggregates with DISTINCT

+ Grouping, Semantics of GROUP BY, Aggregates with no GROUP BY

+ and many more...

This App! Very easy to read and follow step-by-step for everyone!! - Enjoy it

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