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Sequence 071 — T1 - SQL mental model and SELECT/FROM

Stage: Technology Gate A — Relational Foundation
Source: CDMP Master Execution Manual

When / purpose

Start SQL as a language for inspecting governed data, not building pipelines.

What you should learn

  • Table, row, column and query result.
  • SELECT and FROM.
  • Column projection.
  • A result set is not the stored table.

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

  1. Use a small Meridian table once PostgreSQL data is available or a practice table from your chosen resource.
  2. Write SELECT * and then explicit-column queries.
  3. Predict the result shape before running.
  4. Explain what changed and what did not.

Meridian application

Use Meridian synthetic data and the local lab environment only when the card calls for practice.

Create / save

5–10 basic SELECT queries.

Stop / boundary

Stop at governance/data-management working depth; do not expand into DBA or engineering specialization.

Completion gate

You can write a simple query from a blank editor and explain the result grain.

NEXT → Sequence 072 — T1 - WHERE and Boolean filtering

Operationalized from the verified canonical 00C Master Execution Manual; not a verbatim transcription.

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