---
id: sql-all
title: "SQL All"
category: "Database"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["SQL ALL Operator", "ALL operator"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["sql", "database", "w3schools", "all", "subquery"]
raw_sources: ["https://www.w3schools.com/sql/sql_all.asp"]
applied_in: []
github_commit: ""
---

# [[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]
```sql
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):
```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).