PHP从数据库中选择数据

Question

<?php
$servername = "localhost";
$username = "root";
$password = "william";
$dbname = "camping";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "SELECT fnavn,enavn,epost,tlf FROM knr ";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["fnavn"]. " - Name: " . $row["enavn"]. " " . $row["epost"]. "ire: " . $row["tlf"]."<br>";
    }
} else {
    echo "0 results";
}
$conn->close();
?>

试过了，还是不行，有大神知道吗？我认为第二个 if 语句有问题

Answer 1

您需要加入表格：

SELECT * FROM produkt
LEFT JOIN produkttype ON (produkt.ptype = producttype.ptype)
WHERE utleid="No"