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3.1 KiB
3.1 KiB
id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
| id | title | category | status | verification_status | canonical_id | aliases | duplicate_of | source_trust_level | confidence_score | created_at | updated_at | review_reason | merge_history | tags | raw_sources | applied_in | github_commit | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| sql-all | SQL All | Database | draft | conceptual |
|
B | 0.88 | 2026-07-04 | 2026-07-04 |
|
|
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);whereoperatoris 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).