Course overview

SQL & PostgreSQL Mastery

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1. SQL Foundations

2. Aggregation & Grouping

COUNT, SUM, AVG & the NULL rule
GROUP BY: one row per group
HAVING vs WHERE
CASE & conditional aggregation

3. Joins

Keys, relationships & how joins work
INNER JOIN & multi-table queries
LEFT, RIGHT & FULL — and the filter trap
Self, cross, semi & anti-joins

4. Subqueries & CTEs

Scalar, IN & correlated subqueries
CTEs: queries as readable pipelines
Recursive CTEs for hierarchies
UNION, INTERSECT & EXCEPT

5. Window Functions

OVER & PARTITION BY
ROW_NUMBER, RANK & top-N-per-group
Frames, running totals & LAG/LEAD
SQL interview patterns

6. Performance & PostgreSQL in Practice

Indexes & the B-tree
Reading EXPLAIN plans
Schema design & constraints
Transactions, upserts & JSONB

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SQL & PostgreSQL Mastery

INNER JOIN & multi-table queries

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