如何從多個查詢中進行乘法和除法？

Question

所以現在我有3個疑問：

讓我們把這個查詢x

SELECT count(*) as totalDrink from 
Drink D join History H where H.drinkName = D.name AND type = 'vodka' and userID = 'sai' 

查詢Ÿ

SELECT count(*) as totalDrink from 
Drink D join Favorite F where F.drinkName = D.name AND type = 'vodka' and userID = 'sai' 

查詢ž

SELECT SUM(totalDrinks) as total FROM (
SELECT COUNT(*) totalDrinks FROM History 
WHERE userID = 'sai' 
UNION ALL 
SELECT COUNT(*) FROM Favorite 
WHERE userID = 'sai' 
) as totalDrink 

基本上我想要做的mySQL和輸出：

（X + Y（0.666））/ Z

Answer 1

大多數直接：

SELECT (
    (
    SELECT COUNT(*) 
    FROM Drink D JOIN History H ON H.drinkName = D.name 
    WHERE type = 'vodka' AND userID = 'sai' 
) + (
    SELECT COUNT(*) 
    FROM Drink D JOIN Favorite F ON F.drinkName = D.name 
    WHERE type = 'vodka' AND userID = 'sai' 
) 
)/(
    (
    SELECT COUNT(*) FROM History WHERE userID = 'sai' 
) + (
    SELECT COUNT(*) FROM Favorite WHERE userID = 'sai' 
) 
)