Linq (01) Linq query contains the basic print cycle data (read by the need to get the primary key value), filtering, sorting, and some are available, as well as the extraction part connected (connected internal and external) packet (packet ID of the specified , grouping can make more than one field, the number of data in each group after the group if more than one, then you print it out), nested queries (first get the first table of the data source, and then get the second table of the data source, Books also define a temporary table to store the resulting data), cross-union (with a delay operator and obtain intersection of two sets and sets). Testing Note: Windows XP can not run this program, you need 64-bit systems.

Linq(01)Linq\Linq(01)\Linq(01)\App.config
............\........\........\bin\Debug\Linq(01).exe
............\........\........\...\.....\Linq(01).exe.config
............\........\........\...\.....\Linq(01).pdb
............\........\........\...\.....\Linq(01).vshost.exe
............\........\........\...\.....\Linq(01).vshost.exe.config
............\........\........\...\.....\Linq(01).vshost.exe.manifest
............\........\........\Book.cs
............\........\........\BookType.cs
............\........\........\Linq(01).csproj
............\........\........\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
............\........\........\...\.....\Linq(01).csproj.FileListAbsolute.txt
............\........\........\...\.....\Linq(01).csprojResolveAssemblyReference.cache
............\........\........\...\.....\Linq(01).exe
............\........\........\...\.....\Linq(01).pdb
............\........\........\...\.....\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs
............\........\........\...\.....\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs
............\........\........\...\.....\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs
............\........\........\Program.cs
............\........\........\...perties\AssemblyInfo.cs
............\........\Linq(01).sln
............\........\Linq(01).v11.suo
............\........\........\obj\Debug\TempPE
............\........\........\bin\Debug
............\........\........\...\Release
............\........\........\obj\Debug
............\........\........\bin
............\........\........\obj
............\........\........\Properties
............\........\Linq(01)
............\Linq(01)
Linq(01)Linq

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