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duplicates

Finding and handling duplicate elements in collections

DatabasesFind SQL Duplicates by Email & Name: GROUP BY Guide

Learn to find and remove SQL duplicates by multiple fields like email and name using GROUP BY, HAVING, window functions. Examples for detecting, retrieving full rows, and safe deletion in MySQL, PostgreSQL, SQL Server.

1 answer• 5 views
ProgrammingFind Duplicates in Python Lists: Set, Counter, Sort

Efficient methods to find duplicates in Python lists using sets, collections.Counter or sorting. Handles unhashable items and covers time and space complexity.

1 answer• 1 view
ProgrammingEnforce Unique customer_id in Pandas DataFrame

Ensure unique customer_id in Pandas: Debug drop_duplicates, normalize types, use set_index(verify_integrity=True), and detect duplicates.

1 answer• 1 view