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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
php-mysql-delete PHP MySQL Delete Programming_Language draft conceptual
DELETE FROM
PHP MySQL 삭제
B 0.9 2026-07-04 2026-07-04
php
programming
w3schools
mysql
delete
https://www.w3schools.com/php/php_mysql_delete.asp

PHP MySQL Delete

🎯 한 줄 통찰 (One-line insight)

Omitting the WHERE clause in a DELETE statement deletes EVERY record in the table — the source flags this with an explicit "NOTE" warning, since DELETE FROM MyGuests (without WHERE id=3) would wipe the entire table rather than doing nothing or erroring. [S1]

🧠 핵심 개념 (Core concepts)

  • DELETE FROM table WHERE condition — removes matching records. [S1]
  • WHERE is what limits the blast radius — omitting it deletes ALL records in the table. [S1]
  • Executed like other write operations$conn->query($sql) (MySQLi OOP), mysqli_query($conn, $sql) (procedural), $conn->exec($sql) (PDO). [S1]

📖 세부 내용 (Details)

  • Delete by ID: $sql = "DELETE FROM MyGuests WHERE id=3"; if ($conn->query($sql) === TRUE) { echo "Record deleted successfully"; } else { echo "Error deleting record: " . $conn->error; }. [S1]
  • PDO equivalent: $sql = "DELETE FROM MyGuests WHERE id=3"; $conn->exec($sql); echo "Record deleted successfully"; wrapped in try/catch(PDOException). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

  • WHERE 절 생략의 파괴적 결과: WHERE 절을 생략하면 테이블의 모든 레코드가 삭제된다는 점이 명시적 경고(NOTE)로 강조됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — id=3 게스트 레코드만 삭제하는 것이 안전한 조건부 삭제의 표준 패턴이다. [S1]

💻 코드 패턴 (Code patterns)

Deleting a specific record, never omitting WHERE (SQL/PHP):

$sql = "DELETE FROM MyGuests WHERE id=3"; // WHERE is mandatory to avoid deleting everything
if ($conn->query($sql) === TRUE) {
    echo "Record deleted successfully";
}

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 "PHP MySQL Delete Data" page (Astra wiki-curation, P-Reinforce v3.1 format).