Tutorials & Guides

CSV Batch Deduplication: Big Data & Cross-Platform

Learn how to batch process multiple CSV files, handle encoding, delimiters and other common issues, supporting deduplication of tens of millions of records. Includes Python script examples.

E-commerce Sellers: Orders/Customer Data Deduplication & Cleansing Guide (SKU/Email/Phone)

Complete e-commerce data cleansing guide: prevent duplicate order imports, merge customer information, aggregate SKU variants. Support multi-channel order deduplication, customer CLV calculation, product inventory integration with both Power Query and SheetCleaner solutions.

Why Excel's Built-in "Remove Duplicates" Isn't Enough? (3 Better Solutions)

5 major limitations of Excel's built-in deduplication feature: no cross-sheet support, no retention rules, no fuzzy matching, no duplicate details, crashes on big data. Provides three more stable solutions: SheetCleaner, Power Query, and Excel 365 formulas.

Excel Cross-Sheet Deduplication Tutorial: Handle Duplicate Data Across Multiple Worksheets

Learn how to deduplicate across multiple worksheets, supporting multi-column combinations and smart strategies, handling millions of records.

Excel Deduplication with Keep Rules: Retain First/Latest Record Guide

Comprehensive guide to Excel deduplication retention rules: keep first, keep latest, keep max value, multi-tier rules. Provides SheetCleaner, Power Query, and Excel 365 formula implementations with complete examples and best practices.

Excel Million-Row Deduplication Without Crashing: Performance Optimization & Crash Prevention Guide

Professional guide for Excel big data processing: 64-bit environment setup, CSV optimization, batch processing strategies. Solve million-row data freezing, memory issues, program crashes, provides SheetCleaner, Power Query, Python script high-performance solutions.

Excel Email Deduplication: Case, Dots & Plus Aliases All Covered

Professional guide for marketing email list cleaning: handle case differences, Gmail dot rules, +alias tags. Supports complex scenarios like ZHANG.SAN@EXAMPLE.COM vs zhangsan@example.com, alice+ads@gmail.com vs alice@gmail.com.

How to Remove Duplicate Phone Numbers in Excel (with Country Codes & Format Standardization)

Essential skills for marketing/customer service list cleaning: standardize phone number formats, handle country codes, and keep the latest records. Supports standardization of various formats like +86 138-0000-1234, 13800001234, 086-13800001234.

Excel Fuzzy Deduplication: Standardization Strategy Checklist, Fuzzy Merge Parameters, Formula & M Code Templates

Find and correctly merge records that look different but are actually the same—covering case, whitespace, symbols, full/half-width, email aliases, phone country codes, approximate spelling, etc.

Google Sheets Deduplication: Functions, Conditional Formatting & Online Tools Comparison (UNIQUE / SORTN / QUERY)

Complete online collaborative data deduplication guide: Google Sheets built-in functions UNIQUE, SORTN, QUERY comparison, conditional formatting to mark duplicates, cross-sheet merge deduplication solutions. Suitable for Google Forms surveys, shared sheets, online collaboration scenarios.

Merge Multiple Customer Lists and Remove Duplicates (Downloadable Template Included)

Professional guide for multi-channel customer list merging: unify field formats, intelligent deduplication, keep latest records. Suitable for form collection, offline events, social media promotion and other multi-source customer data integration with scoring and source tracking.

Excel Multi-Column Deduplication: Keep Unique Data by Combined Conditions

Learn how to use multi-column combinations as unique keys for deduplication, supporting keep-latest, keep-highest rules for customer, product, and order scenarios.

Research/Survey Data Batch Deduplication: Email/Organization/Time Window Composite Key Practice

Professional guide for academic research and survey data cleaning: handle duplicate responses, cross-batch merging, organization name standardization, time window deduplication. Support privacy compliance, retention rule configuration, audit tracking, suitable for academic research, market research, user feedback and other scenarios.