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Sequence 076 — T2 - primary keys, foreign keys and relational reasoning
Stage: Technology Gate A — Relational Foundation
Source: CDMP Master Execution Manual
When / purpose
Understand relationships before joining tables.
What you should learn
- Primary-key purpose.
- Foreign-key purpose.
- One-to-many vs many-to-many awareness.
- Referential integrity concept.
What to read / study
| Priority | Resource | Use now | Stop point |
|---|---|---|---|
| MUST | Technology Competency Roadmap | Use the exact active technology block and stopping boundary. | Do not study later blocks. |
| REFERENCE | Detailed Technology Competency Reference | Use only the section named by this card. | Do not convert the reference into a separate curriculum. |
Do this in order
- Inspect Customer, Order and OrderItem relationship candidates.
- Draw keys/relationships before writing joins.
- Explain what an orphan record would mean.
Meridian application
Use Meridian synthetic data and the local lab environment only when the card calls for practice.
Create / save
Key/relationship sketch.
Stop / boundary
Stop at governance/data-management working depth; do not expand into DBA or engineering specialization.
Completion gate
You can identify likely keys and explain the business meaning of the relationship.
NEXT → Sequence 077 — T2 - INNER JOIN
Operationalized from the verified canonical 00C Master Execution Manual; not a verbatim transcription.
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