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-select-into
+title: "SQL Select Into"
+category: "Database"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["SQL SELECT INTO Statement", "SELECT INTO", "SQL 테이블 복사"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["sql", "database", "w3schools", "selectinto", "backup"]
+raw_sources: ["https://www.w3schools.com/sql/sql_select_into.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[SQL Select Into]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+SELECT INTO creates a brand-new table populated from an existing one — useful for backups or ad-hoc analysis tables — but does not carry over primary keys, indexes, or NOT NULL constraints. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **SELECT INTO statement** — creates a new table and fills it with data from an existing table. [S1]
+- **Constraint loss** — the new table gets the same column names/types as the source, but NOT primary keys, indexes, or NOT NULL constraints. [S1]
+- **Syntax (full copy)** — `SELECT * INTO newtable [IN external_db] FROM sourcetable WHERE condition;`. [S1]
+- **Syntax (partial copy)** — `SELECT column1, column2, ... INTO newtable [IN external_db] FROM sourcetable WHERE condition;`. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Empty-schema-clone trick** — `SELECT * INTO newtable FROM sourcetable WHERE 1 = 0;` creates a new, empty table with the source's schema, by using a condition that structurally can never be true. [S1]
+- **Multi-table copy** — SELECT INTO can source from a JOIN across multiple tables, not just a single table. [S1]
+
+## 📖 세부 내용 (Details)
+- Full backup copy: `SELECT * INTO CustomersBackup2026 FROM Customers;`. [S1]
+- Backup into another database: `SELECT * INTO CustomersBackup2026 IN 'Backup.mdb' FROM Customers;`. [S1]
+- Copy specific columns only: `SELECT CustomerName, ContactName INTO Customers2 FROM Customers;`. [S1]
+- Copy a filtered subset: `SELECT * INTO US_Customers FROM Customers WHERE Country = 'USA';`. [S1]
+- Copy from a JOIN: `SELECT Customers.CustomerName, Orders.OrderID INTO CustomersOrder FROM Customers LEFT JOIN Orders ON Customers.CustomerID = Orders.CustomerID;`. [S1]
+- Empty schema-only clone: `SELECT * INTO newtable FROM sourcetable WHERE 1 = 0;`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음. 다만 새 테이블이 원본의 제약조건(PK/인덱스/NOT NULL)을 물려받지 않는다는 한계가 명시적으로 언급됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 백업 테이블 생성, 분석용 임시 테이블 생성에 전형적으로 쓰인다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Backup copy of a table (SQL):
+```sql
+SELECT * INTO CustomersBackup2026
+FROM Customers;
+```
+Schema-only empty clone (SQL):
+```sql
+SELECT * INTO newtable
+FROM sourcetable
+WHERE 1 = 0;
+```
+
+## ✅ 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 Insert Into Select]], [[SQL Create Table]], [[SQL Left Join]]
+- **참조 맥락:** 새 테이블을 만들며 데이터를 채워야 할 때 사용 — 기존 테이블에 데이터만 옮기려면 대신 INSERT INTO SELECT를 사용.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — SQL SELECT INTO Statement — https://www.w3schools.com/sql/sql_select_into.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "SQL SELECT INTO Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).