我试图用2“while”循环遍历2个不同的SQL表

Question

警告：mysql_fetch_array（）要求参数1为资源，布尔值在第148行的C：\ public_html \ mars \ TaskC \ hitUrl.php中给出

$query  = "SELECT url FROM urls";
$tableQuery = mysql_query($query);


while($row = mysql_fetch_array($tableQuery)){
    $newQuery="SELECT urls,date FROM urls_info WHERE url='{$row['url']}'";
    $newTableQuery=mysql_query($newQuery);

    $newGroupedQuery = $newQuery . "GROUP BY date";

    while($newRow = mysql_fetch_array($newTableQuery)){
        $displayStr .=    "<tr>";
        $displayStr .=    "<td>".$newRow['date']."</td>";
        $displayStr .=    "<td>".$newRow['url']."</td>";
        $displayStr .=    "<td>".num_rows($newQuery)."</td>";
        $displayStr .=    "</tr>";   
    }


}

Answer 1

这似乎是mysql_query失败了， 尝试放这样的东西

$tableQuery = mysql_query($query) or die("Query failed with error: ".mysql_error());

SQL连接更具原生性，更具性能导向性。

Answer 2

始终本地加入：

$newQuery="SELECT urls,date FROM urls_info as info INNER JOIN urls ON info.url = urls.url";