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10_Wiki/Topic_Programming/Topic_SQL/SQL_Not.md

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+---
+id: sql-not
+title: "SQL Not"
+category: "Database"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["SQL NOT Operator", "NOT operator", "SQL 부정"]
+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", "not", "operators", "where"]
+raw_sources: ["https://www.w3schools.com/sql/sql_not.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[SQL Not]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The NOT operator reverses a WHERE condition's truth value, and combines with LIKE, BETWEEN, IN, IS NULL, and comparison operators to express exclusion. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **NOT operator** — returns records that do NOT match the specified criteria, reversing a condition from true to false and vice versa. [S1]
+- **Syntax** — `SELECT ... FROM table_name WHERE NOT condition;`. [S1]
+- **Common NOT combinations** — `NOT LIKE`, `NOT BETWEEN`, `NOT IN`, `IS NOT NULL`, `NOT EXISTS`. [S1]
+- **NOT with comparisons** — "not greater than" and "not less than" are expressed as `WHERE NOT column > value` / `WHERE NOT column < value`, rather than dedicated operators. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Negate-by-wrapping** — rather than a distinct exclusion operator per case, SQL wraps `NOT` around an existing predicate (`=`, `LIKE`, `BETWEEN`, `IN`, comparison), giving a single uniform negation mechanism. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic negated equality: `SELECT * FROM Customers WHERE NOT Country = 'Spain';`. [S1]
+- NOT LIKE: `WHERE CustomerName NOT LIKE 'A%';` excludes names starting with "A". [S1]
+- NOT BETWEEN: `WHERE CustomerID NOT BETWEEN 10 AND 60;` selects rows outside the inclusive range. [S1]
+- NOT IN: `WHERE City NOT IN ('Paris', 'London');` excludes rows matching any listed value. [S1]
+- NOT with comparison: `WHERE NOT CustomerID > 50;` (not greater than) and `WHERE NOT CustomerId < 50;` (not less than). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — NOT은 LIKE/BETWEEN/IN 챕터 각각에서 반대 조건을 표현하는 공통 도구로 재사용된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Basic NOT (SQL):
+```sql
+SELECT * FROM Customers
+WHERE NOT Country = 'Spain';
+```
+NOT combined with IN (SQL):
+```sql
+SELECT * FROM Customers
+WHERE City NOT IN ('Paris', 'London');
+```
+
+## ✅ 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 Where]], [[SQL And]], [[SQL Or]], [[SQL Like]], [[SQL Between]], [[SQL In]]
+- **참조 맥락:** WHERE 절 조건을 반전시켜야 할 때 항상 재사용되는 범용 부정 연산자.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — SQL NOT Operator — https://www.w3schools.com/sql/sql_not.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "SQL NOT Operator" page (Astra wiki-curation, P-Reinforce v3.1 format).