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70 lines
2.7 KiB
Markdown
70 lines
2.7 KiB
Markdown
---
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id: sql-max
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title: "SQL Max"
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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 MAX() Function", "MAX function", "SQL 최댓값"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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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", "max", "aggregate"]
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raw_sources: ["https://www.w3schools.com/sql/sql_max.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[SQL Max]]
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## 🎯 한 줄 통찰 (One-line insight)
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MAX() returns the largest value in a column across numeric, string, or date types, mirroring MIN() in syntax and usage. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **MAX() function** — returns the largest value of the selected column; works with numeric, string, and date data types. [S1]
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- **Syntax** — `SELECT MAX(column_name) FROM table_name WHERE condition;`. [S1]
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- **Unnamed result** — needs an `AS` alias to name the returned column. [S1]
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- **MAX() with GROUP BY** — returns the largest value per group. [S1]
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## 📖 세부 내용 (Details)
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- Highest price: `SELECT MAX(Price) FROM Products;`. [S1]
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- With alias: `SELECT MAX(Price) AS HighestPrice FROM Products;`. [S1]
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- On a date column: `SELECT MAX(BirthDate) AS LatestBirthdate FROM Employees;`. [S1]
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- With GROUP BY: `SELECT MAX(Price) AS HighestPrice, CategoryID FROM Products GROUP BY CategoryID;`. [S1]
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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 — MIN()과 짝을 이뤄 범위(최소~최대) 리포트에 자주 함께 쓰인다. [S1]
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## 💻 코드 패턴 (Code patterns)
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MAX with alias and GROUP BY (SQL):
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```sql
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SELECT MAX(Price) AS HighestPrice, CategoryID
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FROM Products
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GROUP BY CategoryID;
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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:** 0.90
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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 Aggregate Functions]], [[SQL Min]], [[SQL Group By]]
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- **참조 맥락:** 최댓값 조회가 필요한 모든 리포트의 기본 함수 — MIN()과 대칭 관계.
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## 📚 출처 (Sources)
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- [S1] W3Schools — SQL MAX() Function — https://www.w3schools.com/sql/sql_max.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "SQL MAX() Function" page (Astra wiki-curation, P-Reinforce v3.1 format).
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