Querying Chaos: Master SQL from Scratch to Scale odf de graça baixar
por Aliashraf Azimzade
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Descrição do livro
Welcome to the Data Jungle. Leave your perfect spreadsheets at the door. If you have ever picked up a traditional SQL textbook, you’ve probably noticed a trend. They all take place in a utopian alternate reality. In that reality, every customer has a perfectly formatted name, no one ever enters their phone number into the zip code field, time zones apparently don't exist, and the database perfectly reflects reality at all times. If you work in tech, you already know the truth: That world does not exist. Real-world data is messy. It is entered by humans in a hurry, generated by buggy application code, and transmitted over spotty cell networks. It is full of duplicates, logical impossibilities, and silent errors. In Querying Chaos: Master SQL from Scratch to Scale, author Aliashraf Azimzade ditches the sterile, academic tutorials. Instead, you are dropped directly into the hot seat as the newest Data Hire at UrbanGlide, a rapidly expanding, slightly dysfunctional e-scooter sharing startup. The servers are on fire, the CEO needs a revenue report by noon, and you are the only one who can write the query. Using PostgreSQL, the workhorse of the modern tech industry, you will learn how to handle real-world data by progressing through five crucial stages: The Detective: Stop writing for loops. Learn to think in sets, stitch fragmented tables together with JOINs, and extract the truth from millions of rows. The Summarizer: Find the signal in the noise. Master aggregations while dodging the silent killers of database reporting: NULL values, dirty text strings, and UTC time zone traps. The Architect: Stop just reading data and start building realities. Design unbreakable tables, enforce strict rules with DDL constraints, and master the high-stakes world of simultaneous Transactions. The Analyst: Unlock the heavy artillery of SQL. Write clean, modular code with CTEs, and bend time and logic using mind-blowing Window Functions. The Engineer: Look under the hood. Learn how the database actually thinks, build B-Tree Indexes, and read Execution Plans to make a slow query run 100x faster. Whether you are a complete beginner trying to escape Excel, a backend developer tired of fighting your ORM, or an analyst looking to level up to engineering, this book gives you the exact blueprint. You don’t just need to learn SQL syntax. You need to learn how to survive the chaos. Grab your hardhat. It's time to build.
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