C＃のEFコア/ LINQ

Question

の1対多の片側からリレーションシップの数を問い合わせるため、指定された半径内で上位のボリュームでトップ10の製品を返すような、本当に複雑なクエリがあります。これまでは、（raw SQLクエリを使用して）特定の半径内のすべての製品を取得するための動作中のクエリがありました。今問題は注文数でソートされています。以下はクエリです。私は必要に応じて詳細を提供することができます。前もって感謝します！

var prods = _context.Products 
        .FromSql($"SELECT p.* FROM (SELECT s.\"storefrontID\", z.radius, z.distance_unit * DEGREES(ACOS(COS(RADIANS(z.latpoint)) * COS(RADIANS(a.lat)) * COS(RADIANS(z.longpoint - a.lon)) + SIN(RADIANS(z.latpoint)) * SIN(RADIANS(a.lat)))) AS distance FROM public.\"Addresses\" AS a, public.\"Storefronts\" AS s JOIN (SELECT {lat} AS latpoint, {lon} AS longpoint, {radius} AS radius, {distance_unit} AS distance_unit) AS z ON 1=1 WHERE s.\"addressID\" = a.\"addressID\" AND a.lat BETWEEN z.latpoint - (z.radius/z.distance_unit) AND z.latpoint + (z.radius/z.distance_unit) AND a.lon BETWEEN z.longpoint - (z.radius/(z.distance_unit * COS(RADIANS(z.latpoint)))) AND z.longpoint + (z.radius/(z.distance_unit * COS(RADIANS(z.latpoint))))) AS a, public.\"Storefronts\" AS s WHERE distance <= radius AND s.\"storefrontID\" = a.\"storefrontID\"") 
        .Include(p => p.orderProductConnectors.Count()) 
        .OrderByDescending(p => p.orderProductConnectors) 
        .AsNoTracking() 
        .ToList(); 

私はDBソリューションとしてpostgreSQLを使用しています。

Answer 1

推測：あなたは、現在の `OrderByDescending`は何をしているのです

var prods = _context.Products 
        .FromSql($"SELECT p.* FROM (SELECT s.\"storefrontID\", z.radius, z.distance_unit * DEGREES(ACOS(COS(RADIANS(z.latpoint)) * COS(RADIANS(a.lat)) * COS(RADIANS(z.longpoint - a.lon)) + SIN(RADIANS(z.latpoint)) * SIN(RADIANS(a.lat)))) AS distance FROM public.\"Addresses\" AS a, public.\"Storefronts\" AS s JOIN (SELECT {lat} AS latpoint, {lon} AS longpoint, {radius} AS radius, {distance_unit} AS distance_unit) AS z ON 1=1 WHERE s.\"addressID\" = a.\"addressID\" AND a.lat BETWEEN z.latpoint - (z.radius/z.distance_unit) AND z.latpoint + (z.radius/z.distance_unit) AND a.lon BETWEEN z.longpoint - (z.radius/(z.distance_unit * COS(RADIANS(z.latpoint)))) AND z.longpoint + (z.radius/(z.distance_unit * COS(RADIANS(z.latpoint))))) AS a, public.\"Storefronts\" AS s WHERE distance <= radius AND s.\"storefrontID\" = a.\"storefrontID\"") 
        .OrderByDescending(p => p.orderProductConnectors.Count()) 
        .AsNoTracking() 
        .ToList();