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Sequence 082 — T2 readiness check - relational SQL
Stage: Technology Gate A — Relational Foundation
Source: CDMP Master Execution Manual
When / purpose
Prove you can reason across multiple tables before PostgreSQL building work intensifies.
What you should learn
- Join three tables.
- Aggregate without accidental duplication.
- Use a CTE.
- Explain keys and grain.
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
- Answer 5 unseen multi-table questions.
- Write keys/grain before SQL.
- Validate counts.
- Repair any row explosion.
Meridian application
Use Meridian synthetic data and the local lab environment only when the card calls for practice.
Create / save
T2 readiness results.
Stop / boundary
Stop at governance/data-management working depth; do not expand into DBA or engineering specialization.
Completion gate
You can independently join three tables, aggregate correctly and explain the query grain.
NEXT → Sequence 083 — T4 - PostgreSQL object model
Operationalized from the verified canonical 00C Master Execution Manual; not a verbatim transcription.
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