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Interview Prep: Python, PySpark, and SQL Challenges
This content provides interview questions for Data Engineer roles focusing on Python, PySpark, and SQL, along with sample solutions for common problems. Read More ⇢
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SQL and PySpark: Efficient String Slicing Techniques
The content presents two code examples: one for ETL logic in SQL and another for string slicing manipulation using PySpark, demonstrating data processing techniques. Read More ⇢
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How to Work With DATE FORMAT: Top MySQL Examples
The content discusses various MySQL functions for date manipulation, including extraction and formatting of day, month, year, conversion of date formats, and calculations involving dates. Read More ⇢
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5 SQL Queries: You Should not Miss
The content outlines five essential SQL queries—recursive, window, self-join, aggregate filtering, and EXISTS—to improve query-writing skills for tough interviews. Read More ⇢
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How to Build SQL Query: Step-by-Step Guide
A structured method for writing SQL queries involves defining requirements, selecting key columns, planning, writing, optimizing, and testing for efficient data retrieval and modification. Read More ⇢
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PySpark Code: Calculate Click Rates and Salary Matches
The content explains PySpark code for calculating click rates and finding employees with matching salaries in the same department through self-join operations. Read More ⇢
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Understanding Shuffling: Key to PySpark Performance
Shuffling in PySpark redistributes data across partitions during wide transformations like join and groupBy. Reducing shuffling enhances performance by minimizing resource usage and optimizing data processing. Read More ⇢
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How to Resolve PySpark & SQL Puzzle: Merchant Transaction Data
The content details SQL and PySpark methods for identifying active merchants who had transactions in the last three months, emphasizing filtering and performance optimization techniques. Read More ⇢
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AWS Aurora PostgreSQL: Key Points to Know
AWS Aurora PostgreSQL is a fully managed, high-performance database service optimized for PostgreSQL, offering superior scalability and efficiency compared to traditional deployments and services. Read More ⇢
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