Question

在MySQL中，我有两个几乎相同的结构表，包含不同的数据......我想加入这两个表，并从两个表中得到一列的总和。

$fb_sql     = "SELECT campaign_name, adset_name, SUM(reach) AS reach, cpc, id_name, clicks, SUM(amount_spent) AS amount 
               FROM $table 
               WHERE id_campaign_shortname = '". $_GET["lpage"] ."' $where 
               AND date_from = '". $date_from ."' 
               AND date_to = '". $date_to ."' 
               GROUP BY id_name";

$google_sql = "SELECT campaign_name, SUM(reach) AS reach, cpc, id_name, clicks, SUM(amount_spent) AS amount 
               FROM google_msn_adwords_data 
               WHERE id_campaign_shortname = '". $_GET["lpage"] ."' 
               AND date_from = '". $date_from ."' 
               AND date_to = '". $date_to ."' 
               GROUP BY id_name";

但是我希望将两个表合并为一个输出，但是SUM(reach)和SUM(amount_spent)作为总值，f.x。
fb_sql＆＃34;到达＆＃34; SUM为400 google_sql＆＃34;＆＃34} SUM为450，我的触及输出为850。

我目前正在输出数据：

$merged_data = array_merge($fb_result, $google_result);

$jsonArray = array();

if(count($merged_data) > 0) {

    $total = 0;

    foreach($merged_data as $elm) {

        array_push($jsonArray, array(
            "campaign" => array(
                "campaignName" => $elm["campaign_name"],
                "campaignAdsetName" => $elm["adset_name"],
                "campaignReach" => $elm["reach"],
                "campaignSpend" => $elm["amount"],
                "campaignCPC" => $elm["cpc"],
                "campaignClicks" => $elm["clicks"],
                "campaignId" => $elm["id_name"],
            )
        )
        );

        $total += $elm["reach"];

    }

$jsonCampaignDataArray = array("campaignData" => $jsonArray);
$jsonTotalReach = array("totalReach" => $total);

$finalArray = array_merge($jsonCampaignDataArray, $jsonTotalReach);

$json = json_encode($finalArray);

echo $_GET['jsoncallback']. '('. $json . ')';

但正如所描述的，我想要＆＃34;合并＆＃34;在MYSQL级别上作为单个组合结果发生。

Answer 1

您可以使用加入查询，

eg: SELECT bus.id, SUM( bus.type + rate.rating ) 
FROM  `business` bus
JOIN ratings rate ON rate.bus_id = bus.id where rate.bus_id=1;

Answer 2

根据MySQL documentation：

UNION用于组合多个SELECT语句的结果到一个结果集。

看起来像这样：

(SELECT * FROM table1)
UNION
(SELECT * FROM table2);

加入两个mysql表并获得两列的总和值

2 个答案: