如何爲這種情況編寫Sql或LinqToSql？

Question

如何在這種情況下編寫Sql或LinqToSql？

表有下列數據：

Id UserName Price  Date  Status 

1 Mike 2 2010-4-25 0:00:00 Success 
2 Mike 3 2010-4-25 0:00:00 Fail 
3 Mike 2 2010-4-25 0:00:00 Success 
4 Lily 5 2010-4-25 0:00:00 Success 
5 Mike 1 2010-4-25 0:00:00 Fail 
6 Lily 5 2010-4-25 0:00:00 Success 
7 Mike 2 2010-4-26 0:00:00 Success 
8 Lily 5 2010-4-26 0:00:00 Fail 
9 Lily 2 2010-4-26 0:00:00 Success 
10 Lily 1 2010-4-26 0:00:00 Fail 

我想從數據彙總結果，該結果應該是：

UserName Date TotalPrice TotalRecord SuccessRecord FailRecord 
Mike  2010-04-25 8   4   2   2 
Lily  2010-04-25 10   2   2   0 
Mike  2010-04-26 2   1   1   0 
Lily  2010-04-26 8   3   1   2 

The TotalPrice is the sum(Price) groupby UserName and Date 
The TotalRecord is the count(*) groupby UserName and Date 
The SuccessRecord is the count(*) groupby UserName and Date where Status='Success' 
The FailRecord is the count(*) groupby UserName and Date where Status='Fail' 
The TotalRecord = SuccessRecord + FailRecord 

在SQL Server 2005數據庫的腳本是：

/****** Object: Table [dbo].[Pay] Script Date: 04/28/2010 22:23:42 ******/ 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Pay]') AND type in (N'U')) 
BEGIN 
CREATE TABLE [dbo].[Pay](
[Id] [int] IDENTITY(1,1) NOT NULL, 
[UserName] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL, 
[Price] [int] NULL, 
[Date] [datetime] NULL, 
[Status] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL, 
CONSTRAINT [PK_Pay] PRIMARY KEY CLUSTERED 
(
[Id] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) 
) 
END 
GO 
SET IDENTITY_INSERT [dbo].[Pay] ON 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (1, N'Mike', 2, CAST(0x00009D6300000000 AS DateTime), N'Success') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (2, N'Mike', 3, CAST(0x00009D6300000000 AS DateTime), N'Fail') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (3, N'Mike', 2, CAST(0x00009D6300000000 AS DateTime), N'Success') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (4, N'Lily', 5, CAST(0x00009D6300000000 AS DateTime), N'Success') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (5, N'Mike', 1, CAST(0x00009D6300000000 AS DateTime), N'Fail') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (6, N'Lily', 5, CAST(0x00009D6300000000 AS DateTime), N'Success') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (7, N'Mike', 2, CAST(0x00009D6400000000 AS DateTime), N'Success') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (8, N'Lily', 5, CAST(0x00009D6400000000 AS DateTime), N'Fail') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (9, N'Lily', 2, CAST(0x00009D6400000000 AS DateTime), N'Success') 
INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (10, N'Lily', 1, CAST(0x00009D6400000000 AS DateTime), N'Fail') 
SET IDENTITY_INSERT [dbo].[Pay] OFF 

Answer 1

一個可能的SQL查詢將是：

SELECT 
    UserName 
    ,Date 
    ,sum(Price) TotalPay 
    ,count(*) TotalRecord 
    ,sum(case Status when 'Success' then 1 else 0 end) SuccessRecord 
    ,sum(case Status when 'Success' then 0 else 1 end) FailRecord 
from Pay 
group by 
    UserName 
    ,Date 
order by 
    Date 
    ,UserName desc 

這假設當Status爲NULL時，您會將1添加到FailRecord。

Answer 2

覺得這樣做的伎倆

修訂

var summary = from record in table 
       group record by record.UserName + record.Date.ToString() into grp 
       select new 
       { 
        grp.First().UserName, 
        grp.First().Date, 
        TotalPrice = grp.Sum(record => record.Price), 
        TotalRecord = grp.Count(), 
        SuccessRecord = grp.Count(record => record.Status == "Success"), 
        FailRecord = grp.Count(record => record.Status == "Fail") 
       };