Question

所以我试图从最高声望和最高经验（xp）中排序

public function getRank($user, $skill, $mode) {
    $skill2 = strtolower($skill)."_xp";
    $skill3 = strtolower($skill)."_prestiges";
    $stmt = $this->conn->prepare("SELECT (
                    SELECT COUNT(*) FROM hs_users WHERE mode = :mode AND (
                        $skill3 >= u.$skill3 AND $skill2 >= u.$skill2
                    )
                ) AS rank 
                FROM hs_users u 
                WHERE username = :user AND mode = :mode2 
                LIMIT 1");

    $stmt->bindParam(":user", $user);
    $stmt->bindParam(":mode", $mode);
    $stmt->bindParam(":mode2", $mode);
    $stmt->execute();
    return $stmt->fetchColumn();
}

目前我获得了重复排名，两个人排名第一。

例如如果某人有声望1和3,000,000经验，然后有人声望0和4,000,000经验他们达到相同的排名，至于第二个人被认为是2级。

我一直在尝试ORDER BY，但它似乎并没有起作用。我对SQL查询没有太多经验，如果你有任何指示或者可以帮助我做得很好。

Answer 1

如果声望是主要排名属性：

$stmt =  $this->conn->prepare("SELECT id, $skill3, $skill2
              FROM hs_users
              WHERE username = :user 
                  AND mode = :mode
                  ");
$stmt->bindParam(":user",$user);
$stmt->bindParam(":mode",$mode);
if($stmt->execute()){
    $user = $stmt->fetch(PDO::FETCH_ASSOC);// get the users id, prestige and experience level
}
$higherPrestiges = array();
$stmt = $this->conn->prepare("SELECT id
                                 FROM hs_users
                                 WHERE $skill3 >= :skill3
                                     AND mode = :mode");
$stmt->bindParam(":skill3",$user[$skill3]);
$stmt->bindParam(":mode",$mode);
if($stmt->execute()){
    while($row = $stmt->fetch(PDO::FETCH_COLUMN)){ //get all users that have higher prestige
        $higherPrestiges[$row] = $row;
    }

}
if(count($higherPrestiges) > 0){
    $higherPrestiges_implode = implode(",",$higherPrestiges);
}else{
    $higherPrestiges_implode = "0";
}
$lowerExperiences = array();
$stmt = $this->conn->prepare("SELECT id 
                                 FROM hs_users
                                 WHERE $skill3 = :skill3
                                     AND $skill2 < :skill2
                                     AND mode = :mode");
$stmt->bindParam(":skill2",$user[$skill2]);
$stmt->bindParam(":skill3",$user[$skill3]);
$stmt->bindParam(":mode",$mode);
if($stmt->execute()){
    while($row = $stmt->fetch(PDO::FETCH_COLUMN)){//get users with lower experience with the same prestige
        $lowerExperiences[$row] = $row; 
    }
}

if(count($lowerExperiences) > 0){
    $lowerExperiences_implode = implode(",",$lowerExperiences);
}else{
    $lowerExperiences_implode = "0";
}

$stmt = $this->conn->prepare("SELECT COUNT(id) 
                                 FROM hs_users
                                 WHERE mode = :mode 
                                     AND id IN(".$higherPrestiges_implode.")
                                     AND id NOT IN(".$lowerExperiences_implode.")");
$stmt->bindParam(":mode",$mode);
if($stmt->execute()){
    $rank = $stmt->fetch(PDO::FETCH_COLUMN);//get number of users that have higher or equal prestige and exclude the ones with lower experience
}

只需替换对＆＃34; id＆＃34;的引用在具有表中主键的列名的查询中

我确实认识到最后3个查询可以与IN子句中的子查询结合使用，但这样可以更容易理解

SQL选择计数多列并排序

1 个答案: