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title

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):

SELECT * FROM Customers
WHERE Country = 'Germany' OR Country = 'Spain';

OR across three conditions (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).

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