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Sequence 074 — T1 - CASE and simple expressions
Stage: Technology Gate A — Relational Foundation
Source: CDMP Master Execution Manual
When / purpose
Create governance-friendly flags without turning SQL into production transformation code.
What you should learn
CASE.- Aliases.
- Simple arithmetic/string/date expressions at working depth.
- Derived flags vs stored values.
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
- Create a simple “needs review” flag from a data condition.
- Explain why the flag is evidence, not a new source of truth.
- Change the condition and predict the impact.
Meridian application
Use Meridian synthetic data and the local lab environment only when the card calls for practice.
Create / save
Flagging query + explanation.
Stop / boundary
Stop at governance/data-management working depth; do not expand into DBA or engineering specialization.
Completion gate
You can create and explain a simple diagnostic classification in SQL.
NEXT → Sequence 075 — T1 readiness check - SQL reader
Operationalized from the verified canonical 00C Master Execution Manual; not a verbatim transcription.
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