C# the query inventory after 20 of the total number of book information, according to the conditions specified query the database to find out the number of stocks accounted for 20 of the data, widely used in statistics to master multiple SQL data queries in database development helpful

AfterPerCentum\AfterPerCentum\AfterPerCentum.csproj
..............\..............\Form1.cs
..............\..............\Form1.Designer.cs
..............\..............\Form1.resx
..............\..............\Program.cs
..............\..............\...perties\AssemblyInfo.cs
..............\..............\..........\Resources.Designer.cs
..............\..............\..........\Resources.resx
..............\..............\..........\Settings.Designer.cs
..............\..............\..........\Settings.settings
..............\AfterPerCentum.sln
..............\AfterPerCentum.suo
..............\DataBase\db_10_Data.MDF
..............\........\db_10_Log.LDF
..............\AfterPerCentum\Properties
..............\AfterPerCentum
..............\DataBase
AfterPerCentum

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