Mysqli LEFT JOIN 计数

Question

我真的是 mysql 我的菜鸟所以我需要帮助..

请帮我将这个mysql转换成mysqli...我搞不懂..

$new_mail = mysql_result(
                  mysql_query(
                       "SELECT COUNT(*) FROM `mail` 
                           LEFT JOIN `contact` ON `mail`.`user_id` = `contact`.`from_id` 
                                              AND `contact`.`user_id` = '$user_id 
                        WHERE `mail`.`from_id` = '$user_id' 
                          AND `mail`.`read` = '0' 
                          AND `mail`.`delete` != '$user_id' 
                          AND `contact`.`ban` != '1'")
               , 0);
if ($new_mail)
    $list[] = '<a href="link">Message - $new_mail </a>'

Answer 1

我转换了...无论如何 tnx :)

$new_mail = mysqli_fetch_array(mysqli_query($db, "SELECT COUNT(*) FROM `mail` LEFT JOIN `contact` ON `mail`.`user_id`=`contact`.`from_id` AND `contact`.`user_id`='$user_id' WHERE `mail`.`from_id`='$user_id' AND `mail`.`obrisano`!='$user_id' AND `contact`.`ban`!='1'"));

@ryan 我只是想将 mysql 查询转换为 mysqli，但是 tnx :)

Mysqli LEFT JOIN 计数

Mysqli LEFT JOIN count

php

mysql

mysqli

left-join