試圖完善查詢

Question

我只是尋找矩形形式的時刻，所以我試圖讓它與香草mysql在phpmyadmin上工作，我想有一個數據庫，其中有多個區域可能有潛在的重疊，每個區域每平方像素都有一個「成本」，所以您可以在某個點獲得成本或者測量整個區域的成本，同時忽略重疊的部分，也可以獲得總成本的平均值在數據庫中。

我想知道如果你們中的一個mysql的獸醫可以幫我寫這樣的查詢/數據庫架構，我已經有一些或多或少

select sum(c.cost) 
from (select x.num as x, y.num as y, max(priority) as maxpriority 
     from numbers x 
     cross join numbers y 
     join costs c 
     on x.num between c.x and c.x + c.deltax 
     and y.num between c.y + c.deltay 
     where x.value between PIXELX and PIXELX and DELTAX and 
     y.value between PIXELY and PIXELY and DELTAY 
     group by x.num, y.num) xyp 
join costs c 
on xyp.x between c.x and c.x + c.deltax 
and xyp.y between c.y + c.deltay 
and xyp.maxpriority = c.priority 

這似乎是無效的，並充滿了錯誤，也沒有數據庫架構被提及。我已經花了很多時間來嘗試糾正它，並使其工作，但它一直返回null。

在此先感謝，我很感激。

下面是模式： 這是一個數字：

Collation Attributes Null Default Extra Action 
    1 num int(11)   No None   Change  Drop Browse distinct values  More 

這是成本：

# Name Type Collation Attributes Null Default Extra Action 
1 x int(11)   No None   Change  Drop Browse distinct values  More 
2 y int(11)   No None   Change  Drop Browse distinct values  More 
3 deltax int(11)   No None   Change  Drop Browse distinct values  More 
4 deltay int(11)   No None   Change  Drop Browse distinct values  More 
5 priority int(11)   No None   Change  Drop Browse distinct values  More 

Answer 1

開始通過在查詢糾正錯誤：

select sum(c.cost) 
from (select x.num as x, y.num as y, max(priority) as maxpriority 
     from numbers x 
     cross join numbers y 
     join costs c 
     on x.num between c.x and c.x + c.deltax 
     and y.num between c.y + c.deltay 
     where (x.value between PIXELX and PIXELX + DELTAX) -- + instead of and 
     and (y.value between PIXELY and PIXELY + DELTAY)  -- + instead of and 
     group by x.num, y.num) xyp 
join costs c 
on (xyp.x between c.x and c.x + c.deltax) 
and (xyp.y between c.y and c.y + c.deltay)     -- added c.y 
and xyp.maxpriority = c.priority 

然後，如果你仍然沒有得到想要的結果，請單獨嘗試內部查詢來查看返回的結果rom那。