sql-server-2005 - 查询合并两个子查询的结果

Question

我有 2 个表，其值如下所示

tblIncome（日期，收入）

• 2012 年 12 月 2 日 1000
• 14/02/2012 2000
• 2012 年 10 月 3 日 1500
• 2012 年 5 月 3 日 5000

tblExpense（日期，费用）

• 2012 年 5 月 2 日 1200
• 2012 年 10 月 2 日 1000
• 15/03/2012 2000

预期结果是（月、收入、费用）

• 二月 3000 2200
• 三月 6500 2000

Answer 1

您的问题要求提供“日历表”。这个词在社区中是众所周知的，谷歌会给出很多点击。

这就是我的样子

完成所需的其他月份的表格（最好使用脚本）

一旦到位，您可以在此脚本中运行下面的查询，该查询将为您提供结果

CREATE TABLE [dbo].[Calendar](
    [MonthName] [varchar](20) NULL,
    [StartdateInclusive] [datetime] NULL,
    [EnddateExclusive] [datetime] NULL
)

INSERT [dbo].[Calendar] ([MonthName], [StartdateInclusive], [EnddateExclusive]) VALUES (N'February', CAST(0x00009FEA00000000 AS DateTime), CAST(0x0000A00700000000 AS DateTime))
INSERT [dbo].[Calendar] ([MonthName], [StartdateInclusive], [EnddateExclusive]) VALUES (N'March', CAST(0x0000A00700000000 AS DateTime), CAST(0x0000A02600000000 AS DateTime))


CREATE TABLE [dbo].[tblIncome](
    [Date] [datetime] NULL,
    [Income] [money] NULL
)

INSERT [dbo].[tblIncome] ([Date], [Income]) VALUES (CAST(0x00009FF500000000 AS DateTime), 1000.0000)
INSERT [dbo].[tblIncome] ([Date], [Income]) VALUES (CAST(0x00009FF700000000 AS DateTime), 2000.0000)
INSERT [dbo].[tblIncome] ([Date], [Income]) VALUES (CAST(0x0000A01000000000 AS DateTime), 1500.0000)
INSERT [dbo].[tblIncome] ([Date], [Income]) VALUES (CAST(0x0000A00B00000000 AS DateTime), 5000.0000)

CREATE TABLE [dbo].[tblExpense](
    [Date] [datetime] NULL,
    [Expense] [money] NULL
)

INSERT [dbo].[tblExpense] ([Date], [Expense]) VALUES (CAST(0x00009FEE00000000 AS DateTime), 1200.0000)
INSERT [dbo].[tblExpense] ([Date], [Expense]) VALUES (CAST(0x00009FF300000000 AS DateTime), 1000.0000)
INSERT [dbo].[tblExpense] ([Date], [Expense]) VALUES (CAST(0x0000A01500000000 AS DateTime), 2000.0000)



SELECT  MonthName ,
        SUM(Income) ,
        SUM(Expense)
FROM    ( SELECT    MonthName ,
                    i.Income ,
                    NULL AS Expense
          FROM      dbo.Calendar c
                    LEFT JOIN dbo.tblIncome i ON c.StartdateInclusive <= i.Date
                                                 AND i.Date < c.enddateExclusive
          UNION
          SELECT    MonthName ,
                    NULL ,
                    e.Expense AS Expense
          FROM      dbo.Calendar c
                    LEFT JOIN dbo.tblExpense e ON c.StartdateInclusive <= e.Date
                                                  AND e.Date < c.enddateExclusive
        ) AS d
GROUP BY MonthName