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78 lines
3.4 KiB
Markdown
78 lines
3.4 KiB
Markdown
---
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id: sql-not
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title: "SQL Not"
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category: "Database"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["SQL NOT Operator", "NOT operator", "SQL 부정"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["sql", "database", "w3schools", "not", "operators", "where"]
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raw_sources: ["https://www.w3schools.com/sql/sql_not.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[SQL Not]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **NOT operator** — returns records that do NOT match the specified criteria, reversing a condition from true to false and vice versa. [S1]
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- **Syntax** — `SELECT ... FROM table_name WHERE NOT condition;`. [S1]
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- **Common NOT combinations** — `NOT LIKE`, `NOT BETWEEN`, `NOT IN`, `IS NOT NULL`, `NOT EXISTS`. [S1]
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- **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]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **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]
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## 📖 세부 내용 (Details)
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- Basic negated equality: `SELECT * FROM Customers WHERE NOT Country = 'Spain';`. [S1]
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- NOT LIKE: `WHERE CustomerName NOT LIKE 'A%';` excludes names starting with "A". [S1]
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- NOT BETWEEN: `WHERE CustomerID NOT BETWEEN 10 AND 60;` selects rows outside the inclusive range. [S1]
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- NOT IN: `WHERE City NOT IN ('Paris', 'London');` excludes rows matching any listed value. [S1]
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- NOT with comparison: `WHERE NOT CustomerID > 50;` (not greater than) and `WHERE NOT CustomerId < 50;` (not less than). [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — NOT은 LIKE/BETWEEN/IN 챕터 각각에서 반대 조건을 표현하는 공통 도구로 재사용된다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Basic NOT (SQL):
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```sql
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SELECT * FROM Customers
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WHERE NOT Country = 'Spain';
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```
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NOT combined with IN (SQL):
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```sql
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SELECT * FROM Customers
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WHERE City NOT IN ('Paris', 'London');
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[SQL Tutorial]]
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- **관련 개념:** [[SQL Where]], [[SQL And]], [[SQL Or]], [[SQL Like]], [[SQL Between]], [[SQL In]]
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- **참조 맥락:** WHERE 절 조건을 반전시켜야 할 때 항상 재사용되는 범용 부정 연산자.
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## 📚 출처 (Sources)
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- [S1] W3Schools — SQL NOT Operator — https://www.w3schools.com/sql/sql_not.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "SQL NOT Operator" page (Astra wiki-curation, P-Reinforce v3.1 format).
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