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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 | ||||||||
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| php-mysql-select-where | PHP MySQL Select Where | Programming_Language | draft | conceptual |
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B | 0.89 | 2026-07-04 | 2026-07-04 |
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PHP MySQL Select Where
🎯 한 줄 통찰 (One-line insight)
This chapter reuses the EXACT same PHP structure as the plain SELECT chapter — only the SQL string itself changes (... WHERE lastname='Doe' appended) — demonstrating that filtering logic lives entirely in the SQL layer, with zero changes needed to the PHP fetch/loop code around it. [S1]
🧠 핵심 개념 (Core concepts)
WHERE column operator value— filters records matching a condition. [S1]- Same PHP wrapper as plain SELECT — connection,
query(),num_rows/rowCount()check,fetch_assoc()/fetch()loop are all identical; only the SQL string differs. [S1]
📖 세부 내용 (Details)
- Filtered select:
$sql = "SELECT id, firstname, lastname FROM MyGuests WHERE lastname='Doe'"; $result = $conn->query($sql); if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>"; } }. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.
🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — lastname='Doe' 조건으로 특정 게스트만 조회하는 것이 필터링의 대표 실전 사례다. [S1]
💻 코드 패턴 (Code patterns)
Filtering results with WHERE, same PHP structure as plain SELECT (PHP/MySQLi):
$sql = "SELECT id, firstname, lastname FROM MyGuests WHERE lastname='Doe'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
echo "id: " . $row["id"] . " - Name: " . $row["firstname"] . " " . $row["lastname"] . "<br>";
}
}
✅ 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 Select, PHP MySQL Select Order By
- 참조 맥락: WHERE 조건 필터링 — ORDER BY 정렬(Select Order By) 챕터로 이어짐.
📚 출처 (Sources)
- [S1] W3Schools — PHP MySQL The WHERE Clause — https://www.w3schools.com/php/php_mysql_select_where.asp
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "PHP MySQL The WHERE Clause" page (Astra wiki-curation, P-Reinforce v3.1 format).