共用方式為

尋找數值序列中的最小值

  • 發行項

使用 Min 運算子可傳回數值序列中的最小值。

範例 1

下列範例會尋找任何產品的最低單價。

如果您對 Northwind 範例資料庫執行這個查詢，則輸出為：2.5000。

System.Nullable<Decimal> lowestUnitPrice =
    (from prod in db.Products
    select prod.UnitPrice)
    .Min();

Console.WriteLine(lowestUnitPrice);

Dim lowestUnitPrice = Aggregate prod In db.Products _
                      Into Min(prod.UnitPrice)

Console.WriteLine(lowestUnitPrice)

範例 2

下列範例會尋找任何訂單的最低運費金額。

如果您對 Northwind 範例資料庫執行這個查詢，則輸出為：0.0200。

System.Nullable<Decimal> lowestFreight =
    (from ord in db.Orders
    select ord.Freight)
    .Min();

Console.WriteLine(lowestFreight);

Dim lowestFreight = Aggregate ord In db.Orders _
                    Into Min(ord.Freight)

Console.WriteLine(lowestFreight)

範例 3

下列範例會使用 Min 來尋找各分類中具有最低單價的 Products。 輸出會按照分類排列。

var minQuery =
    from prod in db.Products
    group prod by prod.CategoryID into grouping
    select new
    {
        grouping.Key,
        LeastExpensiveProducts =
            from prod2 in grouping
            where prod2.UnitPrice == grouping.Min(prod3 =>
            prod3.UnitPrice)
            select prod2
    };

foreach (var grp in minQuery)
{
    Console.WriteLine(grp.Key);
    foreach (var listing in grp.LeastExpensiveProducts)
    {
        Console.WriteLine(listing.ProductName);
    }
}

Dim minQuery = From prod In db.Products() _
               Group prod By prod.CategoryID Into grouping = Group _
               Select CategoryID, LeastExpensiveProducts = _
                   From prod2 In grouping _
                   Where prod2.UnitPrice = grouping.Min(Function(prod3) _
                   prod3.UnitPrice)

For Each grp In minQuery
    Console.WriteLine(grp.CategoryID)
    For Each listing In grp.LeastExpensiveProducts
        Console.WriteLine(listing.ProductName)
    Next
Next

如果您對 Northwind 範例資料庫執行前一個查詢，則結果會類似下列：

1

Guaraná Fantástica

2

Aniseed Syrup

3

Teatime Chocolate Biscuits

4

Geitost

5

Filo Mix

6

Tourtière

7

Longlife Tofu

8

Konbu

另請參閱