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Sql for Beginners: Learn Sql For Beginner's Guide to Managing, Analyzing

Posted By: Free butterfly
Sql for Beginners: Learn Sql For Beginner's Guide to Managing, Analyzing

Sql for Beginners: Learn Sql For Beginner's Guide to Managing, Analyzing by Zizo Rizk
English | 2022 | ISBN: N/A | ASIN: B09N21L4MD | 233 pages | EPUB | 6.69 Mb

SQL (Structured Query Language) enables us to create tables, apply constraints, and manipulate data in a database. In this book we will concentrate on queries that allow us to extract information from a database by describing the subset of data we need. That data might be a single number, such as a product price, a list of the names of members with overdue subscriptions, or a calculation, such as the total dollar amount of products sold in the past 12 months. In this book we will be looking at different ways to approach a query so that it can be expressed correctly in SQL.
Before getting into the nuts and bolts of how to specify queries, we will review some of the ideas and terminology associated with relational databases. We will also look at data models, which are a succinct way of depicting how a particular database is put together, that is, what data is being kept where and how everything is interrelated.
It is imperative that the underlying database has been designed to accurately represent the situation it is dealing with. This means not only that suitable tables have been created, but also that appropriate constraints have been applied so that the data is consistent and stays consistent as the database evolves. Even with all the fanciest SQL in the world, you are unlikely to get accurate responses to queries if the underlying database design is faulty. If you are setting up a new database, you should refer to a design book before embarking on the project.

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