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Exercises completed at http://sqlbolt.com/ between July 6th and 12th 2016. Lesson 1: …SQLBolt is by far the best SQL tutorial that I've ever seen! Yes, I know, it's a very bold statement. But I promise that it's true. With hundreds of books, videos, and other tutorials around, the problem of delivering the understanding of data management, databases, and SQL to regular people still hasn't been sold. ButSQL Lesson 1: SELECT queries 101. To retrieve data from a SQL database, we need to write SELECT statements, which are often colloquially refered to as queries. A query in itself is just a statement which declares what data we are looking for, where to find it in the database, and optionally, how to transform it before it is returned. SQLBolt. SQL Relational Database. Learn SQL with simple, interative exercise. What is SQL? SQL, or Structured Query Language, query, manipulate, and transform data from a relational database. Relational database. Collection of related (two-dimensional) tables An alternative to NULL values in your database is to have data-type appropriate default values, like 0 for numerical data, empty strings for text data, etc. But if your database needs to store incomplete data, then NULL values can be appropriate if the default values will skew later analysis (for example, when taking averages of numerical data).I would say start leaning how to use an IDE and practice like you were at an internship/job. LinkedIn learning has a good course to help you get started with Microsoft SQL Server 2016 (taught by Martin Guidry)Welcome to SQLBolt, a series of interactive lessons and exercises designed to help you quickly learn SQL right in your browser. What is SQL? SQL, or Structured Query Language, is a language designed to allow both technical and non-technical users query, manipulate, and transform data from a relational database. 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