我有一個 MySQL 數(shù)據(jù)庫行，用于存儲游戲的嘗試次數(shù)和平均得分：+-----+----------+-----------+| uid | attempts | avg_score ||  4  |    3     |    15     |+-----+----------+-----------+用戶完成游戲后，我想更新這兩個表以根據(jù)新的嘗試計算出新的平均值。我想：乘以（嘗試* avg_score = 45）將trial_score添加到總avg_score（avg_score（45）+ trial_score（5）= 50）除以（avg_score（45）+ trial_score（5）/嘗試=嘗試+ 1）對于 PHP mySQL 語句，這有點讓我頭疼。我將在下面展示我的嘗試。$sql=("UPDATE gamescore SET attempts = attempts + 1,avg_score = ((attempts * avg_score + ?) / (attempts = attempts + 1)) WHERE uid=?");$stmt = $conn->prepare($sql);$stmt->bind_param("ii",$_POST['trial_score'],$_SESSION['uid']);$stmt->execute();失敗..顯然...我需要在這里更正什么？謝謝！