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SQL Database Introduction / of SQL Database RoadMap

SQL Roadmap – Beginner to Advanced

1️⃣ SQL Introduction

Beginner
  • What is SQL?
  • What is Database, Table, Row, Column?
  • Why SQL is required?
  • Real‑time examples: Banking, E‑commerce, Employee data

2️⃣ SQL Commands

Foundation
  • DDL – CREATE, ALTER, DROP, TRUNCATE
  • DML – INSERT, UPDATE, DELETE
  • DQL – SELECT
  • TCL – COMMIT, ROLLBACK, SAVEPOINT
  • DCL – GRANT, REVOKE

3️⃣ SQL Keys & Constraints

Very Important
  • Primary Key, Foreign Key, Composite Key
  • NOT NULL, UNIQUE, CHECK, DEFAULT
  • Ensures data accuracy and integrity

4️⃣ SQL Joins

Core Skill
  • INNER JOIN
  • LEFT JOIN
  • RIGHT JOIN
  • FULL OUTER JOIN
  • SELF JOIN
  • Used to connect multiple tables

5️⃣ SQL Sub Queries

Intermediate
  • Single Row Subquery
  • Multi Row Subquery
  • Correlated Subquery
  • Used in filtering & complex conditions

6️⃣ SQL CTE (WITH Clause)

Advanced
  • Simplifies complex queries
  • Recursive CTE for hierarchy
  • Improves readability
  • Used in Data Engineering

7️⃣ SQL Window Functions

High Demand
  • ROW_NUMBER(), RANK(), DENSE_RANK()
  • SUM() OVER(), Moving averages
  • Running totals
  • Used in BI, Analytics, Big Data

8️⃣ Stored Procedures

Professional
  • Reusable SQL programs
  • Performance improvement
  • Secure business logic
  • Used for reports & automation

9️⃣ SQL Interview Questions

Placement Ready
  • WHERE vs HAVING
  • DELETE vs TRUNCATE
  • Primary vs Unique Key
  • CTE vs Subquery
  • Window Functions vs GROUP BY

🔟 SQL + Python

Real Time
  • Connect Python to Database
  • Execute SQL from Python
  • Use Pandas for data analysis
  • ETL, Automation, Reporting

Final Learning Flow

Beginner → Basics & Commands
Intermediate → Joins & Subqueries
Advanced → CTE & Window Functions
Professional → Stored Procedures & Python Integration