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data-validation-patterns

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Migration data validation patterns: row count comparison, checksums, sampling validation, FK integrity, and business rule validation query design guide. Use this skill for requests involving 'data validation', 'migration validation', 'checksum', 'row count comparison', 'integrity validation', 'regression testing', 'Go/No-Go checklist', etc. Enhances validation-engineer's validation design capabilities. Note: schema mapping and rollback planning are outside the scope of this skill.

en/34-data-migration/.claude/skills/data-validation-patterns/skill.md

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Mar 22, 2026
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# Data Validation Patterns — Migration Validation Patterns Guide

A systematic collection of patterns and queries for verifying data integrity before and after migration.

## Validation Layer Model

```
Level 5: Business Rule Validation  <- Domain-specific rules
Level 4: Cross-Reference Validation <- Inter-table relationships
Level 3: Data Value Validation      <- Transformation accuracy
Level 2: Schema Validation          <- Structural match
Level 1: Count Validation           <- Row/column count match
```
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