Guida prodotto · 5 min di lettura
Finding duplicates in CSV files without a database
Sort by candidate keys, scan runs, and use filters, lightweight dedup recon before SQL DISTINCT.
Pubblicato il 21 marzo 2025 · 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.