同時查詢列和列的計算PostgreSQL

Question

我有兩個表，Products和BundleProducts與BaseProducts有ooo關係。 A BundleProduct是使用與Products表格的m2m關係的Products的集合。 Products具有price列，並且BundleProduct的價格計算爲其Products的價格總和。

BaseProducts有像name和description列這樣我就可以查詢它來獲取兩Products和BundleProducts。

是否可以查詢和sort by price既爲Products的price列和計算BundleProducts的price？

Answer 1

嘗試這樣：

SELECT name, description, price 
FROM (
    SELECT name, description, price FROM products 
    UNION 
    SELECT bundle_products.name, bundle_products.description, sum(products.price) 
    FROM bundle_products 
    JOIN products on (<your join condition) 
    GROUP BY bundle_products.name, bundle_products.description 
) AS combined 
ORDER BY price