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10_Wiki/Dev/Topic_SQL/SQL_Or.md

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+---
+id: sql-or
+title: "SQL Or"
+category: "Database"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["SQL OR Operator", "OR operator", "SQL 논리합"]
+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", "or", "operators", "where"]
+raw_sources: ["https://www.w3schools.com/sql/sql_or.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[SQL Or]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The OR operator filters records so that a row is returned if ANY of the chained conditions in the WHERE clause is true. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **OR operator** — combines multiple conditions in a WHERE clause; a record is returned if at least one condition is TRUE. [S1]
+- **Syntax** — `SELECT ... FROM table_name WHERE condition1 OR condition2 OR condition3 ...;`. [S1]
+- **AND vs. OR** — OR requires only one condition true, whereas AND requires all conditions true. [S1]
+- **Combining AND and OR** — mixing the two requires parentheses to control evaluation grouping. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Multi-condition OR chain** — three or more OR'd conditions (`City = 'Berlin' OR CustomerName LIKE 'G%' OR Country = 'Norway'`) generalize cleanly beyond a simple two-value check. [S1]
+
+## 📖 세부 내용 (Details)
+- Filter on two alternative values: `SELECT * FROM Customers WHERE Country = 'Germany' OR Country = 'Spain';`. [S1]
+- Filter on three OR'd conditions: `WHERE City = 'Berlin' OR CustomerName LIKE 'G%' OR Country = 'Norway';`. [S1]
+- Mixed AND/OR needs parentheses for the intended grouping (see [[SQL And]] for the worked example). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — SQL IN 연산자가 동일 컬럼에 대한 다중 OR 조건의 축약형으로 이후 챕터에서 소개된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+OR across two values (SQL):
+```sql
+SELECT * FROM Customers
+WHERE Country = 'Germany' OR Country = 'Spain';
+```
+OR across three conditions (SQL):
+```sql
+SELECT * FROM Customers
+WHERE City = 'Berlin' OR CustomerName LIKE 'G%' OR Country = 'Norway';
+```
+
+## ✅ 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 In]]
+- **참조 맥락:** WHERE 절 다중 조건 결합의 기본 연산자 — AND/NOT과 세트로 이해해야 하며, IN 연산자로 축약 가능.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — SQL OR Operator — https://www.w3schools.com/sql/sql_or.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "SQL OR Operator" page (Astra wiki-curation, P-Reinforce v3.1 format).