Excel
8 tutorials grouped around Excel, so readers can continue by topic.
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 for large files.
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 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.
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.