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Sequence 080 — T2 - HAVING, CASE and grouped diagnostics
Stage: Technology Gate A — Relational Foundation
Source: CDMP Master Execution Manual
When / purpose
Filter groups and build basic governance indicators.
What you should learn
HAVINGvsWHERE.- Conditional aggregation concept.
- Grouped exception counts.
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
- Find groups exceeding an exception threshold.
- Count missing/invalid conditions by source or domain.
- Explain why WHERE and HAVING act at different stages.
Meridian application
Use Meridian synthetic data and the local lab environment only when the card calls for practice.
Create / save
Grouped diagnostic queries.
Stop / boundary
Stop at governance/data-management working depth; do not expand into DBA or engineering specialization.
Completion gate
You can produce a simple exception summary and explain each filter.
NEXT → Sequence 081 — T2 - CTEs and readable validation logic
Operationalized from the verified canonical 00C Master Execution Manual; not a verbatim transcription.
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