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SQL: Breaking down Advance sql components — Part 1

Comprehensive coverage of SQL components

Pravash
6 min readDec 31, 2024

Introduction

As modern databases become more complex, mastering advanced SQL techniques is essential for data analysts, engineers, and developers to efficiently solve sophisticated business problems.

In this article I will dive deep into advanced SQL components, providing a comprehensive overview of key functionalities such as joins, window functions, advanced filtering techniques, set operations, subqueries, and Common Table Expressions (CTEs).

Let’s explore these components with examples to enhance your SQL proficiency —

1. JOINS

Joins are used to combine rows from two or more tables based on a related column between them. They allow you to retrieve data that spans multiple tables, enabling comprehensive analysis and reporting.

self join — Table is joined to itself, for scenarios where data within the same table needs to be compared
cross join — Combines all rows from one table with all rows from another table, resulting in a Cartesian product, for scenarios like generating all possible combinations of two datasets.

-- self join
SELECT e1.employee_id AS employee_1…

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Pravash
Pravash

Written by Pravash

I am a passionate Data Engineer and Technology Enthusiast. Here I am using this platform to share my knowledge and experience on tech stacks.

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