PHP - 從MySQL

Question

我的表是串聯行，我知道，表可怕，但老： http://sqlfiddle.com/#!9/f2680/1

+----+-----------------------+----------+------+ 
 
| ID | COUNTRY    | QUANTITY | EACH | 
 
+----+-----------------------+----------+------+ 
 
| 1 | U.S.A     |  1 | 12 | 
 
| 2 | U.K.     |  2 | 3 | 
 
| 3 | GERMANY    | NULL | 3 | 
 
| 4 | FRANCE;GERMANY; U.S.A |  0 | 7 | 
 
| 5 | U.S.A;GERMANY   |  3 | 8 | 
 
| 6 | GERMANY;FRANCE;U.S.A |  1 | 10 | 
 
+----+-----------------------+----------+------+

<?php 
 
include 'bd_cnx.php'; 
 
    $ret =[['Test','Valori livrare']]; 
 
    $sql = "SELECT SUBSTRING_INDEX(COUNTRY, ';', 1) AS COUNTRY, 
 
       SUM(COALESCE(IF(QUANTITY = NULL OR QUANTITY = 0,1,QUANTITY),1) * EACHCOL) AS PRICE 
 
      FROM table1 
 
      GROUP BY COUNTRY"; 
 

 
    $result = $conn->query($sql); 
 
    if ($result->num_rows > 0){ 
 
    while($row = $result->fetch_assoc()){ 
 
     $ret[] =[$row['COUNTRY'], floatval($row['PRICE'])]; 
 
    } 
 
} 
 
    echo json_encode($ret); 
 
?>

我的SQL代碼返回行：法國= 3，德國= 6，德國= 12，美國= 12，美國= 7

我想將來自COUNTRY列的結果值（使它們唯一）分組，然後使SUM和finaly生成下一個表單：FRANCE = 3; GERMANY = 18; U.S.A = 19。我將在下面的表格中介紹谷歌圖表中的這些行：['country'，'value']。 謝謝！

Answer 1

使用該查詢額外的選擇...組通過對第一查詢：

select COUNTRY, sum(PRICE) from(
SELECT 
    SUBSTRING_INDEX(COUNTRY, ';', 1) AS COUNTRY, 
    SUM(COALESCE(IF(QUANTITY = NULL OR QUANTITY = 0,1,QUANTITY),1) * EACHCOL) AS PRICE 
FROM table1 
GROUP BY COUNTRY) as t 
group by COUNTRY;