mysql - 查找從同一個ip登錄的用戶

Question

我正在運行一個交友網站，我想知道哪些用戶擁有多個配置文件。

我有一個用戶日誌表（用戶標識，IP地址），我想找到所有用戶從同一個IP地址登錄 - 我只想要結果超過1個用戶從相同的IP登錄。

在此先感謝。

Answer 1

這聽起來像一個簡單的GROUP BY與HAVING所以我會認爲這是你想要什麼：

SELECT "ip address" 
FROM userlog 
GROUP BY "ip address" 
HAVING COUNT(*) > 1 

這會給你的用戶的所有IP地址。要獲得實際的用戶：

SELECT "ip address", userid 
FROM userlog 
WHERE "ip address" IN (
    SELECT "ip address" 
    FROM userlog 
    GROUP BY "ip address" 
    HAVING COUNT(*) > 1 
) 
ORDER BY "ip address" 

Answer 2

您的查詢會是這個樣子......

$ip = $_SERVER['REMOTE_ADDR']; 
$email = mysql_real_escape_string($_POST[email]); 
$password = mysql_real_escape_string($_POST[password]); 

$qry = "SELECT * FROM accounts WHERE email = '$email' && password = '$password' && ip = '$ip'"; 
$result = mysql_query($qry); 
if(mysql_num_rows($result) == 1) { 
//What you want to do if it matches with an already logged ip 
} 

好運。