Set Operations

In data engineering, set operations are essential for data reconciliation, deduplication, access control analysis, and finding differences between datasets. Understanding these operations lets you answer questions like "which users have access to both systems?" or "which records exist in the source but not the destination?" with simple, efficient code. Union - Combining Sets Notice that bob and diana appear in both original sets but only once in the union. Sets automatically handle deduplication, making union perfect for merging user lists, combining tags or categories, or aggregating items from multiple sources. Finding Common Elements Difference: Unique Elements Difference is essential for validation tasks, detecting changes between versions, finding gaps in data coverage, and identifyin