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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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title

SQL Views

🎯 한 줄 통찰 (One-line insight)

A view is a virtual table backed only by a stored SELECT definition, not a data copy — so it always reflects real-time data, and updating it requires vendor-specific syntax (ALTER VIEW vs. CREATE OR REPLACE VIEW). [S1]

🧠 핵심 개념 (Core concepts)

SQL view — a virtual table based on the result-set of an SQL statement; fields come from one or more real tables. [S1]
Always real-time — the database only stores the view's SELECT definition, not a data copy, so querying a view always reflects current data. [S1]
Syntax (create) — CREATE VIEW view_name AS SELECT column1, column2, ... FROM table_name WHERE condition;. [S1]
Querying a view — SELECT * FROM view_name;, exactly like querying a real table. [S1]
Updating a view — ALTER VIEW (SQL Server) vs. CREATE OR REPLACE VIEW (MySQL/Oracle). [S1]
Dropping a view — DROP VIEW view_name;. [S1]

🧩 추출된 패턴 (Extracted patterns)

View as a saved query with a table name — a view can encapsulate a subquery-based filter (e.g. "products above average price") behind a simple table-like name, hiding the underlying complexity from downstream queries. [S1]

📖 세부 내용 (Details)

Simple filtered view: CREATE VIEW [Brazil Customers] AS SELECT CustomerName, ContactName FROM Customers WHERE Country = 'Brazil';, queried as SELECT * FROM [Brazil Customers];. [S1]
View wrapping a subquery: CREATE VIEW [Products Above Average Price] AS SELECT ProductName, Price FROM Products WHERE Price > (SELECT AVG(Price) FROM Products);. [S1]
Update a view (SQL Server): ALTER VIEW [Brazil Customers] AS SELECT CustomerName, ContactName, City FROM Customers WHERE Country = 'Brazil';. [S1]
Update a view (MySQL/Oracle): CREATE OR REPLACE VIEW [Brazil Customers] AS SELECT CustomerName, ContactName, City FROM Customers WHERE Country = 'Brazil';. [S1]
Drop a view: DROP VIEW [Brazil Customers];. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

뷰 갱신 문법이 벤더별로 다름: SQL Server는 ALTER VIEW, MySQL/Oracle은 CREATE OR REPLACE VIEW를 사용. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — AVG() 서브쿼리를 뷰로 감싸 재사용 가능한 이름으로 노출하는 예시가 소스에 직접 등장한다. [S1]

💻 코드 패턴 (Code patterns)

Create and query a view (SQL):

CREATE VIEW [Brazil Customers] AS
SELECT CustomerName, ContactName
FROM Customers
WHERE Country = 'Brazil';

SELECT * FROM [Brazil Customers];

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: SQL Tutorial
관련 개념: SQL Select, SQL Avg, SQL Create Table
참조 맥락: 복잡한 쿼리를 재사용 가능한 가상 테이블로 감싸야 할 때 사용.

📚 출처 (Sources)

[S1] W3Schools — SQL Views — https://www.w3schools.com/sql/sql_view.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "SQL Views" page (Astra wiki-curation, P-Reinforce v3.1 format).

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