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10_Wiki/Dev/Topic_PHP/PHP_MySQL_Delete.md

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+---
+id: php-mysql-delete
+title: "PHP MySQL Delete"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["DELETE FROM", "PHP MySQL 삭제"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "mysql", "delete"]
+raw_sources: ["https://www.w3schools.com/php/php_mysql_delete.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).