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3.5 KiB
3.5 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-create-table | PHP MySQL Create Table | Programming_Language | draft | conceptual |
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B | 0.89 | 2026-07-04 | 2026-07-04 |
|
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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):
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).