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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
sql-update SQL Update Database draft conceptual
SQL UPDATE Statement
UPDATE statement
SQL 수정
B 0.9 2026-07-04 2026-07-04
sql
database
w3schools
update
https://www.w3schools.com/sql/sql_update.asp

SQL Update

🎯 한 줄 통찰 (One-line insight)

UPDATE modifies existing records, and omitting its WHERE clause is a critical footgun that silently rewrites every row in the table. [S1]

🧠 핵심 개념 (Core concepts)

  • UPDATE statement — updates or modifies one or more existing records in a table. [S1]
  • SyntaxUPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;. [S1]
  • WHERE determines scope — the WHERE clause specifies exactly which record(s) get updated. [S1]

🧩 추출된 패턴 (Extracted patterns)

  • Missing-WHERE footgun — the source explicitly warns: omit WHERE and ALL records in the table are updated. This is called out twice (as a "Note" and as an "Update Warning!") — a strong signal that this is the most common and costly mistake with this statement. [S1]

📖 세부 내용 (Details)

  • Update a single record: UPDATE Customers SET ContactName = 'Alfred Schmidt', City= 'Frankfurt' WHERE CustomerID = 1;. [S1]
  • Update multiple records matching a condition: UPDATE Customers SET ContactName='Juan' WHERE Country='Mexico';. [S1]
  • Update ALL records (WHERE omitted — dangerous, shown as a cautionary example): UPDATE Customers SET ContactName='Juan';. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음. WHERE 생략의 위험성이 소스 내에서 두 차례 강조됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 프로덕션에서 UPDATE 실행 전 WHERE 조건을 SELECT로 먼저 검증하는 습관이 소스의 경고에서 자연스럽게 도출된다. [S1]

💻 코드 패턴 (Code patterns)

Update one record (SQL):

UPDATE Customers
SET ContactName = 'Alfred Schmidt', City= 'Frankfurt'
WHERE CustomerID = 1;

Update matching multiple records (SQL):

UPDATE Customers
SET ContactName='Juan'
WHERE Country='Mexico';

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 UPDATE Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).