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77 lines
3.2 KiB
Markdown
77 lines
3.2 KiB
Markdown
---
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id: sql-update
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title: "SQL Update"
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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 UPDATE Statement", "UPDATE statement", "SQL 수정"]
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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", "update"]
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raw_sources: ["https://www.w3schools.com/sql/sql_update.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[SQL Update]]
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## 🎯 한 줄 통찰 (One-line insight)
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UPDATE modifies existing records, and omitting its WHERE clause is a critical footgun that silently rewrites every row in the table. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **UPDATE statement** — updates or modifies one or more existing records in a table. [S1]
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- **Syntax** — `UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;`. [S1]
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- **WHERE determines scope** — the WHERE clause specifies exactly which record(s) get updated. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **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]
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## 📖 세부 내용 (Details)
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- Update a single record: `UPDATE Customers SET ContactName = 'Alfred Schmidt', City= 'Frankfurt' WHERE CustomerID = 1;`. [S1]
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- Update multiple records matching a condition: `UPDATE Customers SET ContactName='Juan' WHERE Country='Mexico';`. [S1]
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- Update ALL records (WHERE omitted — dangerous, shown as a cautionary example): `UPDATE Customers SET ContactName='Juan';`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음. WHERE 생략의 위험성이 소스 내에서 두 차례 강조됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 프로덕션에서 UPDATE 실행 전 WHERE 조건을 SELECT로 먼저 검증하는 습관이 소스의 경고에서 자연스럽게 도출된다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Update one record (SQL):
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```sql
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UPDATE Customers
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SET ContactName = 'Alfred Schmidt', City= 'Frankfurt'
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WHERE CustomerID = 1;
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```
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Update matching multiple records (SQL):
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```sql
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UPDATE Customers
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SET ContactName='Juan'
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WHERE Country='Mexico';
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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 Where]], [[SQL Delete]], [[SQL Insert Into]]
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- **참조 맥락:** CRUD의 Update 축 — WHERE 절 누락 위험을 항상 함께 기억해야 한다.
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## 📚 출처 (Sources)
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- [S1] W3Schools — SQL UPDATE Statement — https://www.w3schools.com/sql/sql_update.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "SQL UPDATE Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).
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