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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
sql-check SQL Check Database draft conceptual
SQL CHECK Constraint
CHECK constraint
B 0.9 2026-07-04 2026-07-04
sql
database
w3schools
check
constraints
https://www.w3schools.com/sql/sql_check.asp

SQL Check

🎯 한 줄 통찰 (One-line insight)

CHECK enforces an arbitrary boolean condition on a column (or combination of columns) — an INSERT/UPDATE that would evaluate the condition to FALSE is aborted entirely. [S1]

🧠 핵심 개념 (Core concepts)

  • CHECK constraint — ensures values in a column satisfy a specific condition; evaluates to TRUE or FALSE, and FALSE aborts the entire INSERT/UPDATE with an error. [S1]
  • On CREATE TABLE — inline, e.g. Age int CHECK (Age >= 18). [S1]
  • Named, multi-column CHECKCONSTRAINT chk_PersonAge CHECK (Age >= 18 AND City = 'Sandnes') combines multiple column conditions under one name. [S1]
  • On ALTER TABLEALTER TABLE Persons ADD CHECK (Age >= 18); or the named/multi-column form via ADD CONSTRAINT. [S1]
  • DroppingDROP CONSTRAINT chk_PersonAge; (SQL Server/Oracle/Access) vs. DROP CHECK chk_PersonAge; (MySQL). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

  • 드롭 문법 차이: SQL Server/Oracle/Access는 DROP CONSTRAINT, MySQL은 DROP CHECK를 사용. [S1]

📖 세부 내용 (Details)

  • Single-column CHECK: CREATE TABLE Persons (ID int PRIMARY KEY, LastName varchar(255) NOT NULL, FirstName varchar(255), Age int CHECK (Age >= 18));. [S1]
  • Named, multi-column CHECK: CONSTRAINT chk_PersonAge CHECK (Age >= 18 AND City = 'Sandnes'). [S1]
  • Add to existing table: ALTER TABLE Persons ADD CHECK (Age >= 18);. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — DEFAULT/NOT NULL만으로 표현할 수 없는 임의 비즈니스 규칙(나이 제한, 값 범위)을 강제할 때 쓰인다. [S1]

💻 코드 패턴 (Code patterns)

Named CHECK across two columns (SQL):

CREATE TABLE Persons (
    ID int PRIMARY KEY,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int,
    City varchar(255),
    CONSTRAINT chk_PersonAge CHECK (Age >= 18 AND City = 'Sandnes')
);

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 CHECK Constraint" page (Astra wiki-curation, P-Reinforce v3.1 format).