✅ Complete SQL Roadmap in 2 Months

Month 1: Strong SQL Foundations
Week 1: Database and query basics
- What SQL does in analytics and business
- Tables, rows, columns
- Primary key and foreign key
- SELECT, DISTINCT
- WHERE with AND, OR, IN, BETWEEN
Outcome: You understand data structure and fetch filtered data.

Week 2: Sorting and aggregation
- ORDER BY and LIMIT
- COUNT, SUM, AVG, MIN, MAX
- GROUP BY
- HAVING vs WHERE
- Use case like total sales per product
Outcome: You summarize data clearly.

Week 3: Joins fundamentals
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
- Join conditions
- Handling NULL values
Outcome: You combine multiple tables correctly.

Week 4: Joins practice and cleanup
- Duplicate rows after joins
- SELF JOIN with examples
- Data cleaning using SQL
- Daily join-based questions
Outcome: You stop making join mistakes.

Month 2: Analytics-Level SQL
Week 5: Subqueries and CTEs
- Subqueries in WHERE and SELECT
- Correlated subqueries
- Common Table Expressions
- Readability and reuse
Outcome: You write structured queries.

Week 6: Window functions
- ROW_NUMBER, RANK, DENSE_RANK
- PARTITION BY and ORDER BY
- Running totals
- Top N per category problems
Outcome: You solve advanced analytics queries.

Week 7: Date and string analysis
- Date functions for daily, monthly analysis
- Year-over-year and month-over-month logic
- String functions for text cleanup
Outcome: You handle real business datasets.

Week 8: Project and interview prep
- Build a SQL project using sales or HR data
- Write KPI queries
- Explain query logic step by step
- Daily interview questions practice
Outcome: You are SQL interview ready.

Practice platforms
- LeetCode SQL
- HackerRank SQL
- Kaggle datasets

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