var 一般分组 = from c in ctx.Customers
group c by c.Country into g
where g.Count() > 5
orderby g.Count() descending
select new
{
国家 = g.Key,
顾客数 = g.Count()
};

SELECT [t1].[Country], [t1].[value3] AS [顾客数]
FROM (
SELECT COUNT(*) AS [value], COUNT(*) AS [value2], COUNT(*) AS [value3], [t0].[Country]
FROM [dbo].[Customers] AS [t0]
GROUP BY [t0].[Country]
) AS [t1]
WHERE [t1].[value] > @p0
ORDER BY [t1].[value2] DESC
-- @p0: Input Int32 (Size = 0; Prec = 0; Scale = 0) [5]

var 匿名类型分组 = from c in ctx.Customers
group c by new { c.City, c.Country } into g
orderby g.Key.Country, g.Key.City
select new
{
国家 = g.Key.Country,
城市 = g.Key.City
};

SELECT [t1].[Country], [t1].[City]
FROM (
SELECT [t0].[City], [t0].[Country]
FROM [dbo].[Customers] AS [t0]
GROUP BY [t0].[City], [t0].[Country]
) AS [t1]
ORDER BY [t1].[Country], [t1].[City]

var 按照条件分组 = from o in ctx.Orders
group o by new { 条件 = o.Freight > 100 } into g
select new
{
数量 = g.Count(),
是否超重 = g.Key.条件 ? "是" : "否"
};

SELECT
(CASE
WHEN [t2].[value2] = 1 THEN @p1
ELSE @p2
END) AS [value], [t2].[value] AS [数量]
FROM (
SELECT COUNT(*) AS [value], [t1].[value] AS [value2]
FROM (
SELECT
(CASE
WHEN [t0].[Freight] > @p0 THEN 1
WHEN NOT ([t0].[Freight] > @p0) THEN 0
ELSE NULL
END) AS [value]
FROM [dbo].[Orders] AS [t0]
) AS [t1]
GROUP BY [t1].[value]
) AS [t2]
-- @p0: Input Currency (Size = 0; Prec = 19; Scale = 4) [100]

-- @p1: Input String (Size = 1; Prec = 0; Scale = 0) [是]

-- @p2: Input String (Size = 1; Prec = 0; Scale = 0) [否]