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Sequence 077 — T2 - INNER JOIN
Stage: Technology Gate A — Relational Foundation
Source: CDMP Master Execution Manual
When / purpose
Combine related tables without losing sight of grain.
What you should learn
- Join condition.
INNER JOINresult population.- One-to-many row multiplication.
- Qualified column names.
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
- Join Customer → Order.
- Predict rows before execution.
- Inspect customers without orders and explain why they disappear.
- Write the join from blank.
Meridian application
Use Meridian synthetic data and the local lab environment only when the card calls for practice.
Create / save
INNER JOIN queries.
Stop / boundary
Stop at governance/data-management working depth; do not expand into DBA or engineering specialization.
Completion gate
You can join two tables correctly and state the resulting grain.
NEXT → Sequence 078 — T2 - LEFT JOIN and missing relationships
Operationalized from the verified canonical 00C Master Execution Manual; not a verbatim transcription.
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