docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화

Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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+---
+id: php-mysql-create-table
+title: "PHP MySQL Create Table"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["CREATE TABLE", "AUTO_INCREMENT", "PHP MySQL 테이블 생성"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["php", "programming", "w3schools", "mysql", "create-table"]
+raw_sources: ["https://www.w3schools.com/php/php_mysql_create_table.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[PHP MySQL Create Table]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `reg_date` column's default value (`DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP`) does double duty — it auto-fills on INSERT and auto-refreshes on every UPDATE, meaning a single column definition handles both "record creation time" and "last modified time" without any PHP-side logic. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`CREATE TABLE`** — the SQL command; this chapter creates "MyGuests" with 5 columns. [S1]
+- **Column attributes** — `UNSIGNED` (positive numbers + zero only), `AUTO_INCREMENT` (auto-increases by 1 per new record), `PRIMARY KEY` (uniquely identifies rows, often paired with AUTO_INCREMENT), `NOT NULL` (value required), `DEFAULT value` (fallback when none is provided). [S1]
+- **Every table needs a primary key** — a unique-per-record identifier column. [S1]
+- **Requires create privileges** — a separate permission from admin privileges (used for CREATE DATABASE). [S1]
+
+## 📖 세부 내용 (Details)
+- Full table definition: `CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, email VARCHAR(50), reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP )`. [S1]
+- Executed via MySQLi OOP: `$conn->query($sql)`; procedural: `mysqli_query($conn, $sql)`; PDO: `$conn->exec($sql)` inside try/catch. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — reg_date 컬럼이 생성 시각과 수정 시각을 동시에 자동 관리하는 것이 실전 스키마 설계의 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Column with dual-purpose auto-updating timestamp (SQL):
+```sql
+CREATE TABLE MyGuests (
+    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    firstname VARCHAR(30) NOT NULL,
+    lastname VARCHAR(30) NOT NULL,
+    email VARCHAR(50),
+    reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+)
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.89
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[PHP Tutorial]]
+- **관련 개념:** [[PHP MySQL Create DB]], [[PHP MySQL Insert]], [[SQL Create Table]]
+- **참조 맥락:** 테이블 스키마 정의 — 데이터 삽입(Insert) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — PHP MySQL Create Table — https://www.w3schools.com/php/php_mysql_create_table.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "PHP MySQL Create Table" page (Astra wiki-curation, P-Reinforce v3.1 format).