Overview

Query Anything. Answer Everything. Level-Up Your Data Skills in 2025. Whether you're brand-new to coding or a seasoned analyst who wants sharper querying power, this bootcamp-style guide takes you from ""Hello, SQL"" to writing complex, performance-tuned queries used by data scientists, BI engineers, and cloud developers every day. Updated for the 2025 data stack, you'll work through bite-sized lessons, live database sandboxes, and business-focused projects that mirror what professionals do on the job-no fluff, just practical SQL that sticks. What You'll Learn Core SQL syntax - SELECT, WHERE, ORDER BY, LIMIT Relational thinking & JOIN mastery: INNER, LEFT, SELF, and CROSS joins Aggregations, grouping, window (analytic) functions, and subqueries Data cleaning & transformation with CTEs and conditional logic Building report-ready views, dashboards, and KPI queries Time-series, geospatial, and text-search tricks every analyst should know Query optimisation and indexing for MySQL, PostgreSQL, SQL Server & cloud warehouses Connecting SQL to Python, Excel, and BI tools for end-to-end workflows Hands-on projects: e-commerce sales analysis, churn prediction dataset, IoT sensor logs Career extras: interview-style challenges, certification tips, and portfolio guidance

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