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- Topic_Graphic → Domain_Design
- Topic_Business → Domain_Product
- Topic_General → Domain_General
- _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning),
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- 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서)
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- 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-11 11:05:56 +09:00

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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-sum SQL Sum Database draft conceptual
SQL SUM() Function
SUM function
SQL 합계
B 0.9 2026-07-04 2026-07-04
sql
database
w3schools
sum
aggregate
https://www.w3schools.com/sql/sql_sum.asp

SQL Sum

🎯 한 줄 통찰 (One-line insight)

SUM() totals a numeric column, ignores NULLs, and can take an expression (not just a bare column) — including a value computed by joining in another table's price. [S1]

🧠 핵심 개념 (Core concepts)

  • SUM() function — calculates the total sum of values within a numeric column; ignores NULL values. [S1]
  • SyntaxSELECT SUM(column_name) FROM table_name WHERE condition;. [S1]
  • SUM() with an expression — the argument can be an expression like Quantity * 10, not just a column reference. [S1]
  • SUM() with GROUP BY — returns a sum per group. [S1]

🧩 추출된 패턴 (Extracted patterns)

  • Join-then-sum for real totals — instead of assuming a flat unit price, joining the detail table to the actual Products table and summing Price * Quantity gives the real total, illustrating that SUM() arguments can encode business logic via JOIN + expression. [S1]

📖 세부 내용 (Details)

  • Basic sum: SELECT SUM(Quantity) FROM OrderDetails;. [S1]
  • With WHERE: SELECT SUM(Quantity) FROM OrderDetails WHERE ProductId = 11;. [S1]
  • With alias: SELECT SUM(Quantity) AS total FROM OrderDetails;. [S1]
  • With GROUP BY: SELECT OrderID, SUM(Quantity) AS [Total Quantity] FROM OrderDetails GROUP BY OrderID;. [S1]
  • With an expression: SELECT SUM(Quantity * 10) FROM OrderDetails;. [S1]
  • With a JOIN for real prices: SELECT SUM(Price * Quantity) FROM OrderDetails LEFT JOIN Products ON OrderDetails.ProductID = Products.ProductID;. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 매출/수량 합계 리포트의 기본 함수로, JOIN과 결합한 실제 매출 계산 예시가 소스에 직접 등장한다. [S1]

💻 코드 패턴 (Code patterns)

SUM with expression and JOIN (SQL):

SELECT SUM(Price * Quantity)
FROM OrderDetails
LEFT JOIN Products ON OrderDetails.ProductID = Products.ProductID;

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)

📚 출처 (Sources)

📝 변경 이력 (Change history)

  • 2026-07-04: Initial draft synthesized from the W3Schools "SQL SUM() Function" page (Astra wiki-curation, P-Reinforce v3.1 format).