Add Freudian psychology schema demonstrating foreign key mediation pattern

[Copilot]

Implements a database schema using Freudian structural model (Id, Ego, Superego) to demonstrate foreign key relationships where one table mediates between two others.

Files Added

• T-Sql/freudian-psychology.tsql (328 lines)

  • 5 tables: ID_COMPONENT, SUPEREGO_COMPONENT, EGO_DECISION, PSYCHOLOGICAL_CONFLICT, DEFENSE_MECHANISM_CATALOG
  • Core pattern: EGO_DECISION has FKs to both ID_COMPONENT and SUPEREGO_COMPONENT
  • 10+ example queries (joins, CTEs, window functions)

• T-Sql/freudian-psychology-README.md

  • Schema documentation and educational context

• README.md updated with new schema entry

Key Pattern

CREATE TABLE EGO_DECISION (
  egoDecisionId INT PRIMARY KEY,
  idComponentId INT,
  superegoComponentId INT,
  -- Ego mediates between Id and Superego
  FOREIGN KEY (idComponentId) REFERENCES ID_COMPONENT(idComponentId),
  FOREIGN KEY (superegoComponentId) REFERENCES SUPEREGO_COMPONENT(superegoComponentId)
);

Models scenarios where entity C references both A and B (orders referencing products+customers, tasks referencing projects+employees, etc). Uses psychology concepts for memorability.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>id-ego-superego as key</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes id-ego-superego as key #53

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[ewdlop]

I was aiming for a composite key. @copilot