SQL Intermediate: Complex Queries & Analysis

DURATION 15h Medium

CERTIFICATION Querytech Academy

Course Overview

This beginner course introduces relational databases and the SQL language from the ground up. Designed for Excel users and complete beginners, it focuses on writing clean, standard SQL queries (ANSI SQL) that work across MySQL, PostgreSQL, SQL Server, Oracle, and other platforms.

Curriculum Structure

Comprehensive modules designed for real-world impact

Advanced Filtering & Conditional Logic

Master CASE complex WHERE conditions, and NULL handling

Advanced JOINs & self joins

Handle multiple joins & self referential queries

Subqueries & correlated Subqueries

Build and optimize nested queries

Common tables expressions (CTEs)

write cleaner, more maintainable queries with CTEs

Window Functions (Basics)

use ROW NUMBER, RANK, LAG, and running totals

Advanced Aggregation &Reporting

Combining group with window functions for powerful insight

set operations ,(UNION, INTERSECT,EXCEPT)

Combine results from multiple queries

Temporary tables and table variables

use temporary structures for complex logic

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