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3.1 KiB
3.1 KiB
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 |
|
B | 0.9 | 2026-07-04 | 2026-07-04 |
|
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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)
- 상위/루트: PHP Tutorial
- 관련 개념: PHP MySQL Select Order By, PHP MySQL Update
- 참조 맥락: 레코드 삭제 — 레코드 수정(Update) 챕터로 이어짐.
📚 출처 (Sources)
- [S1] W3Schools — PHP MySQL Delete Data — https://www.w3schools.com/php/php_mysql_delete.asp
📝 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).