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82 lines
3.1 KiB
Markdown
82 lines
3.1 KiB
Markdown
---
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id: sql-all
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title: "SQL All"
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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 ALL Operator", "ALL operator"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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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", "all", "subquery"]
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raw_sources: ["https://www.w3schools.com/sql/sql_all.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[SQL All]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **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]
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- **Typical usage** — commonly used with WHERE and HAVING statements. [S1]
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- **Syntax** — `SELECT column_name(s) FROM table_name WHERE column_name operator ALL (subquery);` where `operator` is a standard comparison operator. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **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]
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## 📖 세부 내용 (Details)
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- 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]
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```sql
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SELECT ProductName
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FROM Products
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WHERE ProductID = ALL (
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SELECT ProductID
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FROM OrderDetails
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WHERE Quantity = 10
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);
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```
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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 — ANY와 대비해서 "적어도 하나 vs. 전부 만족"을 구분해 이해해야 한다. [S1]
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## 💻 코드 패턴 (Code patterns)
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ALL with a comparison operator (SQL):
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```sql
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SELECT ProductName
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FROM Products
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WHERE ProductID = ALL (
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SELECT ProductID
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FROM OrderDetails
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WHERE Quantity = 10
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);
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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:** 0.88
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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 Any]], [[SQL In]], [[SQL Having]]
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- **참조 맥락:** 서브쿼리 결과 전부를 만족해야 하는 조건에 사용 — ANY(하나라도 만족)와 대비.
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## 📚 출처 (Sources)
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- [S1] W3Schools — SQL ALL Operator — https://www.w3schools.com/sql/sql_all.asp
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## 📝 변경 이력 (Change history)
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- 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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