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Mastering SQL for Interviews and Beyond
Paperback
Series: Project
Publisher: Independently Published
Published: Dec 20 2024
Pages: 198
Weight: 1.04
Height: 0.42 Width: 8.50 Depth: 11.00
Language: English
This book provides a thorough exploration of SQL (Structured Query Language), covering everything from the basics to advanced techniques, designed for learners at all levels. It walks readers through the key concepts of databases, query writing, performance optimization, and real-world applications, with a strong focus on practical learning.
Introduction to SQL: Readers will start by understanding the fundamentals of SQL, its history, and its evolution. This section highlights the importance of SQL in modern database management systems, introduces different types of SQL statements (DDL, DML, DCL, TCL), and offers an overview of tools and interfaces commonly used to interact with SQL databases.
Fundamentals of Relational Databases: This section dives into relational database concepts, including tables, rows, and columns, the significance of primary and foreign keys, and the entity-relationship model. It also introduces relational algebra basics, providing a foundational understanding of how relational databases function.
Data Retrieval: SELECT Queries: The book explains how to write basic SELECT statements, use the WHERE clause for filtering data, and sort results with ORDER BY. It further explores how to limit results using LIMIT and OFFSET, and how to fetch distinct values with DISTINCT, providing practical examples of each.
SQL Functions and Operators: Learn about various SQL functions, including aggregate functions (SUM, AVG, COUNT, MIN, MAX), string functions (CONCAT, SUBSTRING, LENGTH), and date and time functions (NOW, DATE_ADD, DATE_DIFF). It also covers logical and arithmetic operators essential for querying data effectively.
Working with Joins and Subqueries: This section explores the different types of joins (INNER, OUTER, LEFT, RIGHT, CROSS) and how they combine data from multiple tables. It also explains the usage of self-joins, subqueries, and the differences between correlated and non-correlated subqueries. Additionally, the chapter covers combining data with UNION and INTERSECT.
Advanced Query Techniques: Dive deeper into SQL with advanced techniques such as CASE statements, window functions (ROW_NUMBER, RANK, PARTITION BY), recursive queries with CTEs (Common Table Expressions), and pivoting/unpivoting data..
Data Manipulation: INSERT, UPDATE, DELETE: Readers will learn how to manipulate data through SQL commands. The book covers inserting data into tables.
Database Design and Normalization:
Indexing and Performance Optimization:
Transactions and Concurrency Control: .
Stored Procedures and Functions:
Interview-Focused Problem Solving: Prepare for SQL-related interview challenges with this section that provides strategies for solving SQL problems.
Common SQL Interview Questions and Solutions: This chapter offers a comprehensive collection of SQL interview questions at basic, intermediate, and advanced levels. It includes real-life case studies, scenario-based problems.
SQL for Real-World Applications: Understand how SQL is applied in real-world scenarios such as data analysis, web development, and ETL processes.
Lab Exercises for Practical Learning: This section contains hands-on exercises for all skill levels. Beginner-level exercises .
This book is an invaluable resource for students, professionals, and anyone eager to master SQL. With detailed explanations, practical examples, and comprehensive exercises, it provides the perfect balance of theory and hands-on practice for anyone looking to build a strong foundation in SQL and its real-world applications.
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