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How To Solve LeetCode 1193
Problem Description The table Transactions has the following columns: - id primary key - country - state enumeration: 'approved' or 'declined' - amount - trans...
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How To Solve LeetCode 586
Problem Overview The task is to identify the customer number that has placed the largest quantity of orders. The Orders table contains two identifier columns:...
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🔥 Day 7: PySpark Joins, Unions, and GroupBy Guide
1. Joins in PySpark — The Heart of ETL Pipelines A join merges two DataFrames based on keys, similar to SQL. Basic Join python df.joindf2, df.id == df2.id, 'in...