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SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
SQL Handwritten Notes Repository: A collection of PDF notes covering SQL concepts with concise definitions and examples. Explore fundamental commands, date/time functions, joins, and more. Contributions welcome!
Free SQL Basics Resource! SQL notes covering syntax, SELECT, INSERT, UPDATE, DELETE, and more. Perfect for beginners and professionals.
Download this eBook for free Chapters. Chapter 1: Getting started with SQL; Chapter 2: ALTER TABLE; Chapter 3: AND & OR Operators; Chapter 4: Cascading Delete; Chapter 5: CASE; Chapter 6: Clean Code in SQL; Chapter 7: Comments; Chapter 8: Common Table Expressions; Chapter 9: CREATE Database; Chapter 10: CREATE FUNCTION; Chapter 11: CREATE TABLE
Watch out for what kind of information you encode in your ids, explicitly and implicitly. Clients may use the structure of your ids to de-anonymize private data, crawl your system in unexpected ways (auto-incrementing ids are a typical sore point), or perform a host of other attacks.
Follow this interactive online SQL training for beginners (and for FREE) and in no time you will learn all the necessary knowledge to start working and to be confident to say you know SQL in a job interview.
5 wrz 2023 · SQL is everywhere these days. Whether you're learning backend development, data engineering, DevOps, or data science, SQL is a skill you'll want in your toolbelt. This a free and open text-based handbook.
