Question

我有一个包含两列的表：第一列包含id（从1到10），第二列包含sales。我按照desc顺序对销售列进行了排序。在这之后，我想以相同的顺序（从1到10）看到Id列。我怎么做？在此先感谢。（我使用的是Microsoft sql server btw）我忘了提到我想在新表中看到这个。我的意思是在新表中，销售将采用新的ID（从1到10）的desc顺序。很抱歉提到这一点。感谢。

Answer 1

SELECT Id, Sales, ROW_NUMBER() OVER(ORDER BY sales DESC)
FROM table
ORDER BY sales DESC

Answer 2

试试这个，

    if (count($errors) == 0) {
        $password = md5($password);
        $query = "SELECT * FROM users WHERE username='$username' AND 
        password='$password'";
        $results = mysqli_query($db, $query);
        if (mysqli_num_rows($results) == 1) {

            $secondQuery    = "SELECT * FROM users WHERE userid='$emptyUserid' 
            AND hash='$emptyHash'";
            $result         = mysqli_query($db,$secondQuery);
            $row            = mysqli_fetch_row($result);
            $emptyUserid    = $row['userid'];
            $emptyHash      = $row['hash'];
            setcookie("userid","$emptyUserid",time()+ (3600 * 24 * 7));
            setcookie("hash","$emptyHash",time()+ (3600 * 24 * 7));

            $_SESSION['username']   = $username;
            $_SESSION['success']    = "You are now logged in";
            header('location: index.php');
        }else {
            array_push($errors, "Wrong username/password combination");
        }
    }
}

更新表后，相同顺序的主键

2 个答案: