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Database Systems • 6 Lessons
Learn Relational SQL, the simple way.
Understand how enterprise relational databases store, index, and query billions of records. Master SELECT queries, JOINs, B-Tree indexes, and ACID transactions.
Course Curriculum
Progress step-by-step from fundamental SELECT filters to advanced query optimization and transaction isolation.
BeginnerPart 01
Part 1: SQL Foundations & Basic Queries
Understand relational databases and write structured queries: SELECT, WHERE, ORDER BY, and CRUD mutations.
2 interactive lessons
Explore LessonsIntermediatePart 02
Part 2: Multi-Table JOINs, Aggregations & Grouping
Combine multiple relational tables with INNER/LEFT JOINs and compute summary statistics with GROUP BY and HAVING.
2 interactive lessons
Explore LessonsAdvancedPart 03
Part 3: Advanced Database Architecture, Indexing & ACID
Master B-Tree index optimization, EXPLAIN execution plans, transaction ACID isolation, and database normalization.
2 interactive lessons
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