select
描述：查询顾客的公司名、地址信息
查询句法：
|
var 构建匿名类型1 = from c in ctx.Customers
select new
{
公司名 = c.CompanyName,
地址 = c.Address
};
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对应SQL：
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SELECT [t0].[CompanyName], [t0].[Address]
FROM [dbo].[Customers] AS [t0]
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描述：查询职员的姓名和雇用年份
查询句法：
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var 构建匿名类型2 = from emp in ctx.Employees
select new
{
姓名 = emp.LastName + emp.FirstName,
雇用年 = emp.HireDate.Value.Year
};
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对应SQL：
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SELECT [t0].[LastName] + [t0].[FirstName] AS [value], DATEPART(Year, [t0].[HireDate]) AS [value2]
FROM [dbo].[Employees] AS [t0]
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描述：查询顾客的ID以及联系信息（职位和联系人）
查询句法：
|
var 构建匿名类型3 = from c in ctx.Customers
select new
{
ID = c.CustomerID,
联系信息 = new
{
职位 = c.ContactTitle,
联系人 = c.ContactName
}
};
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对应SQL：
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SELECT [t0].[CustomerID], [t0].[ContactTitle], [t0].[ContactName]
FROM [dbo].[Customers] AS [t0]
|
描述：查询订单号和订单是否超重的信息
查询句法：
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var select带条件 = from o in ctx.Orders
select new
{
订单号 = o.OrderID,
是否超重 = o.Freight > 100 ? "是" : "否"
};
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对应SQL：
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SELECT [t0].[OrderID],
(CASE
WHEN [t0].[Freight] > @p0 THEN @p1
ELSE @p2
END) AS [value]
FROM [dbo].[Orders] AS [t0]
-- @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]
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