Question

我的桌子是，我知道桌子很糟糕但很旧： 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代码返回行：FRANCE = 3，GERMANY = 6，GERMANY = 12，U.S.A = 12，U.S.A = 7

我想对COUNTRY列中的结果值进行分组（使它们成为唯一的），然后生成SUM并最终生成下一个表单：FRANCE = 3; GERMANY = 18; U.S.A = 19。我将在谷歌图表中以下一种形式介绍这些行：['country'，'value']。谢谢！

Answer 1

在第一个查询中使用此查询和其他选择...分组：

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;

PHP - 从MySQL连接行

1 个答案: