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Sequence 072 — T1 - WHERE and Boolean filtering
Stage: Technology Gate A — Relational Foundation
Source: CDMP Master Execution Manual
When / purpose
Learn to ask precise questions of data.
What you should learn
- Comparison operators.
AND/OR/NOT.- Text/date/numeric conditions.
- Parentheses and logic.
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
- Write filters against a practice/Meridian table.
- Predict which rows should remain.
- Create one intentionally wrong filter and diagnose it.
- Rewrite the query in plain English.
Meridian application
Use Meridian synthetic data and the local lab environment only when the card calls for practice.
Create / save
10 filtering queries + one corrected mistake.
Stop / boundary
Stop at governance/data-management working depth; do not expand into DBA or engineering specialization.
Completion gate
You can translate a plain-language condition into SQL and back.
NEXT → Sequence 073 — T1 - NULL, DISTINCT, ORDER BY and LIMIT
Operationalized from the verified canonical 00C Master Execution Manual; not a verbatim transcription.
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