从多个多对多关系中选择

Question

嗨，我有这个 database，我正在尝试 select 员工可以参加的所有项目（课程）以及基于项目规范的类型和子类型，即员工工作and POSITION and DEPARTMENT and UNIT 和 SECTION 所以我正在尝试 select 为程序规范编号为 7 的员工编写的所有程序但是当我尝试这样做时：

SELECT * FROM [dbo].[ProgramSpecification]
              INNER JOIN [dbo].[ProgramsSpecificationDetails] ON [dbo].[ProgramSpecification].PROGRAM_SPECIFCATION_ID = [dbo].[ProgramsSpecificationDetails].PROGRAM_SPECIFCATION_ID
              INNER JOIN [dbo].[Programs] ON [dbo].[Programs].ProgramID=[dbo].[ProgramsSpecificationDetails].ProgramID 
              INNER JOIN [dbo].[ProgramSubTypesAndProgram] ON [dbo].[Programs].ProgramID = [dbo].[ProgramSubTypesAndProgram].ProgramID
              INNER JOIN [dbo].[ProgramSubTypes] ON [dbo].[ProgramSubTypes].ProgramSubTypeID =  [dbo].[ProgramSubTypesAndProgram].ProgramSubTypeID
              INNER JOIN [dbo].[ProgramTypeAndSubType] ON [dbo].[ProgramSubTypes].ProgramSubTypeID = [dbo].[ProgramTypeAndSubType].ProgramSubTypeID
              INNER JOIN [dbo].[ProgramsTypes] ON [dbo].[ProgramsTypes].ProgeamTypeID = [dbo].[ProgramTypeAndSubType].ProgeamTypeID

预期结果是：

PROGRAM_SPECIFCATION_ID POSITION_ID POSITION    JOB_ID  JOB DEPARTMENT_ID   DEPARTMENT_NAME UNIT_ID UNIT_NAME   SECTION_ID  SECTION_NAME    ProgramID   PROGRAM_SPECIFCATION_ID ProgramID   ProgramName ProgramSubTypeID    ProgramID   ProgramSubTypeID    ProgramSubTypeName  ProgeamTypeID   ProgramSubTypeID    ProgeamTypeID   ProgramTypeName NominationTypeID
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    1   7   1   Corporate Culture   1   1   1   General 1   1   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    2   7   2   Business Etiquette  1   2   1   General 1   1   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    3   7   3   Technical Awareness 2   3   2   TC  1   2   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    4   7   4   Information Security For non Technical People   3   4   3   IS  1   3   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    18  7   18  Supply Chain Management 11  18  11  Procurement 2   11  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    33  7   33  Hyperion Financial Management   13  33  13  Finance 2   13  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    35  7   35  Oracle Financial Applications Overview  13  35  13  Finance 2   13  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    36  7   36  IFRS    13  36  13  Finance 2   13  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    116 7   116 The 7 Habits    41  116 41  Achievement Orientation 4   41  4   CompetencyBased 1

而是 return 这样的结果

PROGRAM_SPECIFCATION_ID POSITION_ID POSITION    JOB_ID  JOB DEPARTMENT_ID   DEPARTMENT_NAME UNIT_ID UNIT_NAME   SECTION_ID  SECTION_NAME    ProgramID   PROGRAM_SPECIFCATION_ID ProgramID   ProgramName ProgramSubTypeID    ProgramID   ProgramSubTypeID    ProgramSubTypeName  ProgeamTypeID   ProgramSubTypeID    ProgeamTypeID   ProgramTypeName NominationTypeID
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    1   7   1   Corporate Culture   1   1   1   General 1   1   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    1   7   1   Corporate Culture   1   1   1   General 3   1   3   Business-Technical  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    1   7   1   Corporate Culture   1   1   1   General 5   1   5    Leadership 2
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    2   7   2   Business Etiquette  1   2   1   General 1   1   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    2   7   2   Business Etiquette  1   2   1   General 3   1   3   Business-Technical  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    2   7   2   Business Etiquette  1   2   1   General 5   1   5    Leadership 2
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    3   7   3   Technical Awareness 2   3   2   TC  1   2   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    4   7   4   Information Security For non Technical People   3   4   3   IS  1   3   1   Business-Awareness  1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    18  7   18  Supply Chain Management 11  18  11  Procurement 2   11  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    33  7   33  Hyperion Financial Management   13  33  13  Finance 2   13  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    35  7   35  Oracle Financial Applications Overview  13  35  13  Finance 2   13  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    36  7   36  IFRS    13  36  13  Finance 2   13  2   Business-Specialized    1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    116 7   116 The 7 Habits    41  116 41  Achievement Orientation 4   41  4   CompetencyBased 1
7   12424   Account Payable Accountant  48  Accountant  587 Finance 650 Accounting  582 Account Payables    116 7   116 The 7 Habits    42  116 42  Adaptability    4   42  4   CompetencyBased 1

在第 2 3 5 6 行它 return 不同程序类型的相同程序知道想要的结果只是具有 ProgramTypeName 业务意识和 ProgramSubTypeName 的结果一般但因为 ProgramType 和 ProgramSubType 有多对多的关系它 return 所有 ProgramType 有 ProgramSubType 一般知道程序规范编号 7 它需要link selected) ProgramTypeName 业务意识和 ProgramSubTypeName 一般

和最后一行 14 中的相同内容，但这里的 ProgramType 两个表是 Programs 和 ProgramSubType，它们具有多对多关系，因此它 return 在结果中所有具有相同 ProgramID 和不同 ProgramSubTypeID 的 ProgramName 知道 PROGRAM SPECIFICATION 编号 7 的想要的结果只是具有 ProgramID 116 和 [=25 的程序=] 41 所以请帮助我如何做到这一点，非常感谢。

Answer 1

因为您有两个多对多关系 - tables ProgramSubTypesAndProgram 和 ProgramTypeAndSubType，您必须更改您的数据库架构才能获得单一结果，例如。将精确类型添加到程序关系 table ProgramSubTypesAndProgram 或使类型-子类型关系仅一对多。

Answer 2

我将我的数据库模式更改为这样然后使用这个拖车查询来查看所有程序和那里的详细信息并查看可用于某个职位的所有程序

查看所有程序并查看详细信息：

SELECT *
FROM [dbo].[Programs]
INNER JOIN [dbo].[ProgramDetails] ON [dbo].[Programs].ProgramID =  [dbo].[ProgramDetails].ProgramID
INNER JOIN [dbo].[ProgramSubTypes] ON [dbo].[ProgramSubTypes].ProgramSubTypeID = [dbo].[ProgramDetails].ProgramSubTypeID
INNER JOIN [dbo].[ProgramsTypes] ON [dbo].[ProgramsTypes].ProgramTypeID = [dbo].[ProgramDetails].ProgramTypeID

查看某个职位可用的所有程序：

SELECT * 
FROM [dbo].[Positions] 
INNER JOIN [dbo].[ProgramsSpecificationDetails] ON [dbo].[Positions].PositionID =  [dbo].[ProgramsSpecificationDetails].PositionID
INNER JOIN [dbo].[ProgramDetails] ON [dbo].[ProgramDetails].ProgramDetailsID = [dbo].[ProgramsSpecificationDetails].ProgramDetailsID 
INNER JOIN [dbo].[Programs] ON [dbo].[Programs].ProgramID =  [dbo].[ProgramDetails].ProgramID
INNER JOIN [dbo].[ProgramSubTypes] ON [dbo].[ProgramSubTypes].ProgramSubTypeID = [dbo].[ProgramDetails].ProgramSubTypeID
INNER JOIN [dbo].[ProgramsTypes] ON [dbo].[ProgramsTypes].ProgramTypeID = [dbo].[ProgramDetails].ProgramTypeID

它给出了想要的结果

从多个多对多关系中选择

Selecting from multiple many to many relationshipes

sql

asp.net

sql-server

sql-server-2008