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Sequence 136 — T7 - merge and cardinality
Context: Technology Gate B - Programmatic Data Management | Technology Gate
Source: CDMP Master Execution Manual
When / purpose
Combine data while validating row-count effects.
What you should learn
- merge keys.
- one-to-one/one-to-many awareness.
- left/inner merge.
- validate expected row counts.
Resources / limits
Technology Competency Roadmap: active T6–T10 only. Detailed Technology Competency Reference: topic detail/readiness only.
Do this in order
- Merge two Meridian sources.
- Write expected cardinality first.
- Inspect unmatched records.
- Diagnose one duplicate-multiplication case.
Meridian application
Use Meridian synthetic files and database only for bounded practice.
Create / save
Merge validation note.
Stop / boundary
Stop before production data engineering, application development, advanced OOP, orchestration or distributed processing.
Completion gate
You can merge and explain why the row count changed.
NEXT → Sequence 137
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