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- What is Hive? Important Points, Interview Questions
- How SQL queries execute in a database, using a real query example.
- Comprehensive guide to important Points and tricky conceptual issues in SQL
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- Azure Databricks tutorial roadmap (Beginner → Advanced), tailored for Data Engineering interviews in India
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Month: April 2024
Indexing is one of the most important SQL performance optimization techniques. When used correctly, it drastically improves read/query speed—especially for large tables. ✅ What is an Index in SQL? An index is a data structure (usually B-Tree) that allows fast access to rows based on key column values, like a book’s index. Think of it…
Normalization and denormalization are two opposing database design techniques aimed at achieving different goals. Let’s explore each concept: Normalization: Normalization is the process of organizing the data in a database to minimize redundancy and dependency. The main objective of normalization is to ensure data integrity and reduce anomalies during data manipulation. Normalization typically involves dividing…