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Premium Course Syllabus

SQL

Condensed Placement Preparation Syllabus

SQL Fundamentals · Joins · Aggregations · Window Functions · Interview Ready

6 Modules
27 Topics
6 Quizzes
Core CS

Ideal For

SQL rounds in campus placements — TCS, Infosys, Wipro, Zoho
Data analyst and backend developer interviews
SQL assessments in AMCAT, eLitmus, and HackerRank
Students building real-world database query skills

Module-Wise Curriculum

A concise, placement-focused syllabus — covers every key concept without overloading.

1

Module 1

Sql Basics & Ddl

  • What is SQL — relational databases, SQL vs NoSQL, SQL dialects (MySQL, PostgreSQL)
  • DDL Commands — CREATE TABLE, ALTER (ADD/MODIFY/DROP), DROP, TRUNCATE
  • Data Types — INT, VARCHAR, TEXT, DATE, FLOAT, BOOLEAN — when to use each
  • Constraints — NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK, DEFAULT
Quiz — SQL Basics
2

Module 2

Dml & Select Queries

  • DML Commands — INSERT INTO, UPDATE SET WHERE, DELETE FROM WHERE
  • SELECT Basics — SELECT *, column aliases, DISTINCT, ORDER BY ASC/DESC
  • WHERE Clause — comparison, BETWEEN, IN, LIKE ('%', '_'), IS NULL
  • GROUP BY & HAVING — aggregate with grouping, filtering groups with HAVING
  • Aggregate Functions — COUNT, SUM, AVG, MIN, MAX with NULL handling
Quiz — DML & SELECT
3

Module 3

Joins & Subqueries

  • INNER JOIN — matching rows in both tables, syntax and visual example
  • LEFT / RIGHT / FULL OUTER JOIN — including non-matching rows
  • SELF JOIN — comparing rows within the same table, employee hierarchy example
  • Subqueries — scalar, row, table subqueries, correlated subqueries
  • CTEs — WITH clause, multiple CTEs, recursive CTEs (overview)
Quiz — Joins & Subqueries
4

Module 4

Advanced Sql

  • Window Functions — ROW_NUMBER, RANK, DENSE_RANK, PARTITION BY, ORDER BY
  • LAG & LEAD — accessing previous and next row values in a window
  • String Functions — CONCAT, SUBSTRING, UPPER, LOWER, TRIM, LENGTH, REPLACE
  • Date Functions — NOW, DATE, DATEDIFF, DATE_FORMAT, EXTRACT
  • CASE Statement — simple CASE and searched CASE for conditional logic
Quiz — Advanced SQL
5

Module 5

Indexes, Views & Transactions

  • Indexes — creating and dropping, clustered vs non-clustered, when to use
  • Views — creating updatable and non-updatable views, materialized view concept
  • Transactions in SQL — BEGIN, COMMIT, ROLLBACK, SAVEPOINT
  • Stored Procedures & Functions — syntax, IN/OUT params, when to use each
Quiz — Performance & Transactions
6

Module 6

Interview Sql Challenges

  • Top SQL Interview Questions — 20 most-asked query problems with solutions
  • Rank & Top-N Problems — Nth highest salary, top 3 per category patterns
  • Duplicate Detection & Removal — finding and deleting duplicate records
  • SQL Optimisation Tips — avoiding SELECT *, index usage, query plan reading
Quiz — SQL Interview Challenges

Pattern-First

Learn recurring patterns, not one-off tricks — the fastest path to solving new problems.

Placement-Ready

Every module ends with an assessment or drill mapped to the way rounds are actually run.

AI-Assisted

Unlimited AI Tutor, Mock Interviews and Resume Review are included with your subscription.

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SQL Notes & Interview Questions for Placements

A query-first SQL course: table design and constraints, then SELECT filtering and grouping, then joins and subqueries, then the window functions and CTEs that separate an average answer from a strong one. Each concept is paired with the shape of question interviewers actually ask — second highest salary, department-wise ranking, duplicate removal, running totals, gaps in dates.

It also covers the parts candidates skip and get caught on: NULL behaviour in aggregates and joins, HAVING versus WHERE, correlated subqueries, index basics and why a query is slow. Written against standard SQL with notes where MySQL and PostgreSQL differ.

What you'll learn in SQL

  • Sql Basics & Ddl
  • Dml & Select Queries
  • Joins & Subqueries
  • Advanced Sql
  • Indexes, Views & Transactions
  • Interview Sql Challenges

Why SQL matters for placements

SQL rounds appear in service-company tests, analyst hiring and almost every backend interview, and they are scored quickly — either your query returns the right rows or it does not. It is also the highest-ROI subject on this list, because the question bank is small and repeats across companies.

Free vs Premium — what's included

Free

  • This full module-wise syllabus and topic list
  • The free revision course for this subject
  • Free core CS question bank and roadmaps
  • Aptitude and DSA practice sheets

Premium

  • Full lesson content for every module listed above
  • Module quizzes and interview question sets
  • Worked examples, numericals and revision drills
  • All 14 premium placement courses, lifetime access

Frequently asked questions

Which SQL topics are asked most in placement interviews?

Joins, GROUP BY with HAVING, subqueries and window functions such as ROW_NUMBER and RANK. Ranking and top-N-per-group questions are the single most repeated category.

Do I need to learn window functions for freshers' interviews?

Yes for product companies and analyst roles, and increasingly for service companies too. They turn several classic multi-subquery answers into a three-line query.

How do I practise SQL without a database installed?

Any browser SQL sandbox works for the query modules; the design and constraint modules only need pen and paper. Recreate the sample employee and orders tables used in the examples.

Also revise

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