MYSQL乘以if？

我有一个查询，看起来像这样：MYSQL乘以if？

//execute the SQL query and return records 
$result = mysql_query("SELECT SUM(ps_order_detail.product_weight) as total_provision, COUNT(ps_order_detail.id_order_detail) as antal_ordrar, ps_customer.firstname 
        FROM ps_order_detail 
        JOIN ps_orders ON ps_order_detail.id_order = ps_orders.id_order 
        JOIN ps_order_history ON ps_orders.id_order = ps_order_history.id_order 
        JOIN ps_customer ON ps_orders.id_customer = ps_customer.id_customer 
        WHERE MONTH(ps_order_history.date_add) = MONTH(CURDATE()) AND (ps_order_history.id_order_state) = '4' OR (ps_order_history.id_order_state) = '13' 
        GROUP BY ps_orders.id_customer 
        ORDER BY SUM(ps_order_detail.product_weight) DESC 
        "); 


//fetch tha data from the database 
while ($row = mysql_fetch_array($result)) 
{ 
    echo '<font size="3">'; 
    echo " Namn: ".$row{'firstname'}. ""; 
    echo " Provision: ".$row{'total_provision'}. ""; 
    echo " Abonnemang: ".$row{'antal_ordrar'}. ""; 
    echo '<br>'; 
    echo '</font size>'; 
}

它工作正常，但我瓦纳做的是，如果结果“antal_ordrar”大于说50余次瓦纳繁衍的结果“total_provision” 1,2 （添加额外的20％的结果）

即时通讯新的和有点卡住了。有任何想法吗？

来源

2011-08-24 HangerS

SELECT SUM(ps_order_detail.product_weight) * 
    IF(COUNT(ps_order_detail.id_order_detail) > 50, 1.2, 1) AS total_provision, 
    COUNT(ps_order_detail.id_order_detail) AS antal_ordrar, ...

来源

2011-08-24 14:10:35 nobody

首先，在一个子查询包裹的：

SELECT 
    -- use the if statement 
    IF(antal_ordrar > 50, total_provision * 1.2, total_provision), 
    antal_ordrar, 
    firstname 
FROM 
    -- create a subquery so you can reuse the data. 
    (SELECT SUM(ps_order_detail.product_weight) as total_provision, 
      COUNT(ps_order_detail.id_order_detail) as antal_ordrar, 
      ps_customer.firstname as firstname 
     FROM ps_order_detail 
     -- are you sure you need this many joins?  
     JOIN ps_orders ON ps_order_detail.id_order = ps_orders.id_order 
     JOIN ps_order_history ON ps_orders.id_order = ps_order_history.id_order 
     JOIN ps_customer ON ps_orders.id_customer = ps_customer.id_customer 
     -- group by normally uses the 'having' keyword. 
     WHERE MONTH(ps_order_history.date_add) = MONTH(CURDATE()) 
      AND (ps_order_history.id_order_state) = '4' 
      OR (ps_order_history.id_order_state) = '13' 
     GROUP BY ps_orders.id_customer 
     ORDER BY SUM(ps_order_detail.product_weight) DESC) 
    -- an alias for your subquery so you can treat it like a table. 
    tbl;

就注意到了这一点。括号表示括号时：$row{'total_provision'}应该是$row['total_provision']。

来源

2011-08-24 13:55:31 cwallenpoole

-1

尝试添加选择

if (antal_ordrar > 50, total_provision * 1.2, total_provision) as total_provision

来源

2011-08-24 13:55:58

TNX ALOT的敏捷和快速方向的所有！使用SELECT SUM（ps_order_detail.product_weight）* IF（COUNT（ps_order_detail.id_order_detail）> 50,1.2,1）作为total_provision – HangerS

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