쿼리문 처리시 관련문의드립니다. 채택완료

안녕하세요 질문하나 가지고왔습니다. ㅎ;

$conn = new mysqli(G5_MYSQL_HOST, G5_MYSQL_USER, G5_MYSQL_PASSWORD, G5_MYSQL_DB);

// 연결 확인

if ($conn->connect_error) {

    die("데이터베이스 연결 실패: " . $conn->connect_error);

}

$sql = "SELECT

            SUM(CASE WHEN g5_member.mb_sex = 'F' THEN 1 ELSE 0 END) AS 여댓글의수,

            SUM(CASE WHEN g5_member.mb_sex = 'M' THEN 1 ELSE 0 END) AS 남댓글의수,

            SUM(CASE WHEN TIMESTAMPDIFF(YEAR, STR_TO_DATE(g5_member.mb_birth, '%Y-%m-%d'), NOW()) BETWEEN 10 AND 19 THEN 1 ELSE 0 END) AS age_10,

            SUM(CASE WHEN TIMESTAMPDIFF(YEAR, STR_TO_DATE(g5_member.mb_birth, '%Y-%m-%d'), NOW()) BETWEEN 20 AND 29 THEN 1 ELSE 0 END) AS age_20,

            SUM(CASE WHEN TIMESTAMPDIFF(YEAR, STR_TO_DATE(g5_member.mb_birth, '%Y-%m-%d'), NOW()) BETWEEN 30 AND 39 THEN 1 ELSE 0 END) AS age_30,

            SUM(CASE WHEN TIMESTAMPDIFF(YEAR, STR_TO_DATE(g5_member.mb_birth, '%Y-%m-%d'), NOW()) BETWEEN 40 AND 49 THEN 1 ELSE 0 END) AS age_40,

            SUM(CASE WHEN TIMESTAMPDIFF(YEAR, STR_TO_DATE(g5_member.mb_birth, '%Y-%m-%d'), NOW()) BETWEEN 50 AND 59 THEN 1 ELSE 0 END) AS age_50,

            SUM(CASE WHEN TIMESTAMPDIFF(YEAR, STR_TO_DATE(g5_member.mb_birth, '%Y-%m-%d'), NOW()) BETWEEN 60 AND 69 THEN 1 ELSE 0 END) AS age_60,

            SUM(CASE WHEN TIMESTAMPDIFF(YEAR, STR_TO_DATE(g5_member.mb_birth, '%Y-%m-%d'), NOW()) >= 70 THEN 1 ELSE 0 END) AS age_70

        FROM g5_write_notice

        JOIN g5_member ON g5_write_notice.mb_id = g5_member.mb_id

        WHERE wr_is_comment = 1";

$result = $conn->query($sql);

네 소스에 문제는 없구요 궁금한게 있어서 질문드립니다.

저는 매번 이런식으로 서버측을 처리를 하고있는데 쿼리문 처리할때 꼭 위처럼 디비접속을 하지않고 처리 하는 법도 있는듯하여 올려봅니다. 혹시나 있으시면 조언좀 부탁드려요