SQL以匹配表

Question

我有查詢一個的兩個結果是：

amount | percent 
100 | 10 
200 | 20 
300 | 30 
400 | 40 

和第二個是：

sales 
10 
20 
110 
120 
210 
220 
310 
320 

有沒有辦法讓smthing這樣的：

sales      | percent 
30 (this is sum below 100) | 10 
230(this is sum between 100 and 200) | 20 
430(this is sum between 200 and 300) | 30 
630(this is sum between 300 and 400) | 40 

我想用PHP數組和循環來做，但我更喜歡不發送很多請求到服務器。有什麼建議麼？

Answer 1

子查詢將執行查詢多次，它是沒有好 這將是更好的做用PHP 這樣的（而不是查詢我有$第一和$ 2排列）

$first = array(
    array(
     'amount' => 100, 
     'percent' => 10 
    ), 
    array(
     'amount' => 200, 
     'percent' => 20 
    ), 
    array(
     'amount' => 300, 
     'percent' => 30 
    ), 
    array(
     'amount' => 400, 
     'percent' => 40 
    ) 
); 
$second = array(
    array(
     'sales' => 10 
    ), 
    array(
     'sales' => 20 
    ), 
    array(
     'sales' => 110 
    ), 
    array(
     'sales' => 120 
    ), 
    array(
     'sales' => 210 
    ), 
    array(
     'sales' => 220 
    ), 
    array(
     'sales' => 310 
    ), 
    array(
     'sales' => 320 
    ) 
); 

$result = array(); 
$second_len = count($second); 
$s=0; 
for ($i=0,$len=count($first); $i < $len; $i++) { 
    $sum = 0; 
    for (;$s < $second_len; $s++) { 
     if ($second[$s]['sales'] <= $first[$i]['amount']) { 
      $sum += $second[$s]['sales']; 
     } else { 
      break; 
     } 
    } 
    $result[] = array(
     'sales' => $sum, 
     'percent' => $first[$i]['percent'] 
    ); 
} 

var_dump($result); 

Answer 2

首先，使用相關子查詢，查找第二個結果集中每行的正確百分比。然後彙總由：

select percent, sum(sales) 
from (select q2.*, 
      (select q1.percent 
       from query1 q1 
       where q1.amount >= q2.sales 
       order by q1.amount desc 
       limit 1 
      ) as percent 
     from query2 q2 
    ) q 
group by percent; 

Answer 3

你說你有兩個「查詢結果」。我猜他們來自桌子。因此，假設您有以下兩個表：

thresholds 
---------- 
amount | percent 
100 | 10 
200 | 20 
300 | 30 
400 | 40 

sales 
----- 
amount 
10 
20 
110 
120 
210 
220 
310 
320 

，你可以用這個查詢得到結果：

SELECT 
    SUM(sales_amount) sales 
    ,threshold_percent percent 
FROM (
    SELECT 
    s.amount sales_amount 
    ,t.amount threshold_amount 
    ,t.percent threshold_percent 
    FROM sales s 
    INNER JOIN thresholds t 
    ON t.amount > s.amount 
    LEFT JOIN thresholds t2 
    ON t2.amount < t.amount 
    AND t2.amount > s.amount 
    WHERE t2.amount IS NULL 
) sales_percents 
GROUP BY threshold_amount 

您可以點擊這裏查詢：SQLFiddle

這應該運行相當快只要您在thresholds.amount和sales.amount上有索引。