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title

SQL All

🎯 한 줄 통찰 (One-line insight)

ALL compares a value against every value returned by a subquery, evaluating to TRUE only if EVERY comparison holds — the "every row must match" counterpart to ANY. [S1]

🧠 핵심 개념 (Core concepts)

ALL operator — compares a value to every value returned by a subquery; TRUE only if every value in the result-set meets the condition. [S1]
Typical usage — commonly used with WHERE and HAVING statements. [S1]
Syntax — SELECT column_name(s) FROM table_name WHERE column_name operator ALL (subquery); where operator is a standard comparison operator. [S1]

🧩 추출된 패턴 (Extracted patterns)

All-or-nothing semantics — because ALL requires every subquery value to satisfy the condition, an equality comparison (= ALL) against a subquery with varied values will almost always be FALSE unless the subquery happens to return a single repeated value. [S1]

📖 세부 내용 (Details)

Products where ALL matching order detail rows have Quantity = 10 (returns FALSE in the worked example, because the Quantity column has many different values, not only 10): [S1]

SELECT ProductName
FROM Products
WHERE ProductID = ALL (
  SELECT ProductID
  FROM OrderDetails
  WHERE Quantity = 10
);

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — ANY와 대비해서 "적어도 하나 vs. 전부 만족"을 구분해 이해해야 한다. [S1]

💻 코드 패턴 (Code patterns)

ALL with a comparison operator (SQL):

SELECT ProductName
FROM Products
WHERE ProductID = ALL (
  SELECT ProductID
  FROM OrderDetails
  WHERE Quantity = 10
);

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: SQL Tutorial
관련 개념: SQL Any, SQL In, SQL Having
참조 맥락: 서브쿼리 결과 전부를 만족해야 하는 조건에 사용 — ANY(하나라도 만족)와 대비.

📚 출처 (Sources)

[S1] W3Schools — SQL ALL Operator — https://www.w3schools.com/sql/sql_all.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "SQL ALL Operator" page (Astra wiki-curation, P-Reinforce v3.1 format).

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