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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-select-where PHP MySQL Select Where Programming_Language draft conceptual
WHERE clause
PHP MySQL 필터링
B 0.89 2026-07-04 2026-07-04
php
programming
w3schools
mysql
where
https://www.w3schools.com/php/php_mysql_select_where.asp

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)

📚 출처 (Sources)

📝 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).