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.
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+---
+id: sql-order-by
+title: "SQL Order By"
+category: "Database"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["SQL ORDER BY Keyword", "ORDER BY clause", "SQL 정렬"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["sql", "database", "w3schools", "orderby", "sorting"]
+raw_sources: ["https://www.w3schools.com/sql/sql_orderby.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[SQL Order By]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+ORDER BY sorts a result-set by one or more columns, ascending by default, and can mix ascending/descending direction per column. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **ORDER BY keyword** — sorts the result-set in ascending (ASC, default) or descending (DESC) order. [S1]
+- **Syntax** — `SELECT column1, column2, ... FROM table_name ORDER BY column1, column2, ... ASC|DESC;`. [S1]
+- **Alphabetical sorting** — for text columns, ORDER BY sorts alphabetically (and reverse-alphabetically with DESC). [S1]
+- **Multi-column sort** — sorting by several columns applies the first column as primary sort key and subsequent columns as tie-breakers. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Per-column direction** — each column in a multi-column ORDER BY can independently specify ASC or DESC, e.g. `ORDER BY Country ASC, CustomerName DESC`. [S1]
+
+## 📖 세부 내용 (Details)
+- Sort ascending by default: `SELECT * FROM Products ORDER BY Price;`. [S1]
+- Sort descending: `SELECT * FROM Products ORDER BY Price DESC;`. [S1]
+- Sort multiple columns, Country first then CustomerName as tie-break: `SELECT * FROM Customers ORDER BY Country, CustomerName;`. [S1]
+- Combine directions per column: `SELECT * FROM Customers ORDER BY Country ASC, CustomerName DESC;`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 정렬은 이후 JOIN/GROUP BY 결과를 사람이 읽기 좋게 만드는 데 반복적으로 함께 쓰인다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Sort ascending (default) then descending (SQL):
+```sql
+SELECT * FROM Products ORDER BY Price;
+SELECT * FROM Products ORDER BY Price DESC;
+```
+Multi-column sort with mixed direction (SQL):
+```sql
+SELECT * FROM Customers
+ORDER BY Country ASC, CustomerName DESC;
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.90
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[SQL Tutorial]]
+- **관련 개념:** [[SQL Select]], [[SQL Where]], [[SQL Group By]]
+- **참조 맥락:** 조회 결과를 정렬해서 보여줘야 하는 모든 쿼리에서 재사용되는 기본 문법.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — SQL ORDER BY Keyword — https://www.w3schools.com/sql/sql_orderby.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "SQL ORDER BY Keyword" page (Astra wiki-curation, P-Reinforce v3.1 format).