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