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2.7 KiB
2.7 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-max | SQL Max | Database | draft | conceptual |
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B | 0.9 | 2026-07-04 | 2026-07-04 |
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SQL Max
🎯 한 줄 통찰 (One-line insight)
MAX() returns the largest value in a column across numeric, string, or date types, mirroring MIN() in syntax and usage. [S1]
🧠 핵심 개념 (Core concepts)
- MAX() function — returns the largest value of the selected column; works with numeric, string, and date data types. [S1]
- Syntax —
SELECT MAX(column_name) FROM table_name WHERE condition;. [S1] - Unnamed result — needs an
ASalias to name the returned column. [S1] - MAX() with GROUP BY — returns the largest value per group. [S1]
📖 세부 내용 (Details)
- Highest price:
SELECT MAX(Price) FROM Products;. [S1] - With alias:
SELECT MAX(Price) AS HighestPrice FROM Products;. [S1] - On a date column:
SELECT MAX(BirthDate) AS LatestBirthdate FROM Employees;. [S1] - With GROUP BY:
SELECT MAX(Price) AS HighestPrice, CategoryID FROM Products GROUP BY CategoryID;. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.
🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — MIN()과 짝을 이뤄 범위(최소~최대) 리포트에 자주 함께 쓰인다. [S1]
💻 코드 패턴 (Code patterns)
MAX with alias and GROUP BY (SQL):
SELECT MAX(Price) AS HighestPrice, CategoryID
FROM Products
GROUP BY CategoryID;
✅ 검증 상태 및 신뢰도
- 상태: draft
- 검증 단계: conceptual
- 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
- 신뢰 점수: 0.90
- 중복 검사 결과: 신규 생성 (New discovery)
🔗 지식 그래프 (Knowledge Graph)
- 상위/루트: SQL Tutorial
- 관련 개념: SQL Aggregate Functions, SQL Min, SQL Group By
- 참조 맥락: 최댓값 조회가 필요한 모든 리포트의 기본 함수 — MIN()과 대칭 관계.
📚 출처 (Sources)
- [S1] W3Schools — SQL MAX() Function — https://www.w3schools.com/sql/sql_max.asp
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "SQL MAX() Function" page (Astra wiki-curation, P-Reinforce v3.1 format).