訂單查詢和其他表

Question

通過ID取的名字，我有兩個表，一個叫果實：

id title 

1 Banana 
2 Apple 
3 Orange 

而第二fruits_chosen：

user_id fruit_id 

    1  1 
    2  1 
    2  3 
    3  1 
    3  2 
    3  3 

它應該返回：

Banana 3 times 
Orange 2 times 
Apple 1 time 

現在我建立一個查詢獲取項目，按count排序，但我不知道如何從標題中獲取標題在同一個查詢中的其他表，有什麼想法？

Answer 1

SELECT 
COUNT(*) as count, 
f.title, 
fruit_id 
FROM fruits_chosen fc 
INNER JOIN fruits f on f.id = fc.fruit_id 
GROUP BY 
fc.fruit_id, f.title 
ORDER BY count DESC 
LIMIT 5 

SqlFiddle

Answer 2

您將要JOIN使用fruit_id到id列，類似這樣的表格：

SELECT f.title, 
    COUNT(fc.fruit_id) as count 
FROM fruits_chosen fc 
INNER JOIN fruits f 
    on fc.fruit_id = f.id 
GROUP BY f.title 
ORDER BY COUNT(fc.fruit_id) DESC LIMIT 5 

見SQL Fiddle with Demo

這是USI將只返回在兩個表中匹配的那些行。如果你想返回所有fruits不管它是否被選中，那麼你可以使用一個LEFT JOIN：

SELECT f.title, 
    COUNT(fc.fruit_id) as count 
FROM fruits f 
LEFT JOIN fruits_chosen fc 
    on fc.fruit_id = f.id 
GROUP BY f.title 
ORDER BY COUNT(fc.fruit_id) DESC LIMIT 5 

見SQL Fiddle with Demo

然後，如果您希望它返回Banana 3 times等，你可以使用在CONCAT功能在MySQL：

SELECT 
    concat(f.title, ' ',COUNT(fc.fruit_id), ' times') Total 
FROM fruits f 
LEFT JOIN fruits_chosen fc 
    on fc.fruit_id = f.id 
GROUP BY f.title 
ORDER BY COUNT(fc.fruit_id) DESC LIMIT 5 

見SQL Fiddle with Demo