Data Analytics

Let's move to our next topic now Data Cleaning & Transformation Data cleaning and transformation are critical for preparing raw data for analysis. It involves handling missing data, removing duplicates, standardizing formats, and optimizing data structures.…

Let's move to our next topic now Data Cleaning & Transformation Data cleaning and transformation are critical for preparing raw data for analysis. It involves handling missing data, removing duplicates, standardizing formats, and optimizing data structures.…

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Normalization in SQL Normalization is the process of organizing a database to reduce redundancy and improve efficiency. It ensures data is stored logically by breaking it into smaller, related tables. 1️⃣ Why Normalize a Database? Eliminates duplicate data…

Indexing in SQL Indexes improve the speed of data retrieval by optimizing how queries access tables. They work like a book’s index—allowing you to find information faster instead of scanning every page. 1️⃣ Types of Indexes in SQL: Primary Index → Automatically…

Window Functions in SQL Window functions perform calculations across a set of table rows related to the current row. Unlike aggregation functions, they do not collapse rows but retain all rows while providing additional insights. 1️⃣ Common Window Functions…

Common Table Expressions (CTEs) in SQL 👇👇 CTEs (WITH statement) help write cleaner and more readable SQL queries. They are like temporary result sets that can be referenced within the main query. 1️⃣ Basic Syntax of CTE WITH cte_name AS ( SELECT column1…