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Finding duplicates in CSV files without a database
Sort by candidate keys, scan runs, and use filters, lightweight dedup recon before SQL DISTINCT.
Опубликовано 21 марта 2025 г. · Table
Without SQL, sort by the natural key (email, order_id, device_id) and look for adjacent identical keys. For composite keys, concatenate in a scratch column or sort by multiple columns.
Limits
- Case sensitivity can hide dupes, normalize case upstream.
- Trailing spaces break key equality.