---
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).
