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Multicolumn primary keys are common in tables that connect two other tables in a many-to-many relationship. A classic many-to-many relationship is the relationship of students and classes. Any one student can register for multiple classes. Most classes have multiple students. A table for storing student grades across multiple classes can have at least three columns. One column can identify the class, such as a ClassID number. A second column can identify individual students with another number, such as StudentID. A third column can store the grade for the student in the class. The CH04PKStudentGrades.sql file shows the syntax for defining a multicolumn primary key in a table called ClassGrades. The CREATE TABLE for the table follows. The ClassID and StudentID columns each have an int data type. The GradeLetter column stores grades. This column has a varchar(2) type. The first character of the GradeLetter column denotes a letter for the grade, and the second column optionally records a + or for grades such as A+ or A . The name for the primary key constraint is PK_ClassGrades. The two columns defining the primary key are ClassID and StudentID. Notice the declaration for this constraint appears at the same level as the column declarations. asp.net read barcode-scanner Barcode in ASP . NET - OnBarcode
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20 Jun 2013 ... How to Read Barcode from Images in C# ... NET barcode APIs for you to quickly develop barcode reader ... NET application in 2 minutes: ... CREATE TABLE ClassGrades( ClassID int, StudentID int, GradeLetter varchar(2), Constraint PK_ClassGrades PRIMARY KEY(ClassID, StudentID) ) The following three INSERT statements attempt to add three new rows to the ClassGrades table. The first statement adds a grade of A for the student with a StudentID of 1 in the class with a ClassID of 1. The second statement adds a grade of B for another student with a StudentID of 2 in the same class as the first student. The third INSERT statement designates a grade of C for a student in the class with a ClassID of 1. This statement does not specify a value for StudentID. Because StudentID is a part of the table s primary key, SSE automatically imposes a NOT NULL constraint for the column. As a result of the missing value for StudentID, the third INSERT statement fails and does not add a new row. INSERT ClassGrades VALUES(1,1,'A') INSERT ClassGrades VALUES(1,2,'B-') INSERT ClassGrades (ClassID, GradeLetter) VALUES(1,'C-') An excerpt from the listing for running the script in CH04PKStudentGrades.sql describes the error message for the null value for StudentID in the third INSERT statement. Then, the listing enumerates the two rows added to the ClassGrades table. The statement generating the following output is SELECT * FROM ClassGrades. Msg 515, Level 16, State 2, Line 4 Cannot insert the value NULL into column 'StudentID', table 'ProSSEAPPSCh04.dbo.ClassGrades'; column does not allow nulls. INSERT fails. The statement has been terminated. ClassID StudentID GradeLetter ----------- ----------- ----------1 1 A 1 2 B- asp.net barcode reader control .NET Barcode Reader SDK for .NET, C# , ASP . NET , VB.NET ...
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If you buy barcode - scanners with an USB-connector, they will have keyboard- emulation. ... Create a new Windows -Forms-Project, add three TextBoxes to the Form via ... NET -code is an automatic translation from C# and may contain one or ... When I scan these barcodes I want its data in each textboxes. Figure 4 43. Vertical text: Like THIS And so on. Note, though, that when you call upon these Orientation options they automatically raise the heights of rows (as also happens with font size changes|) in order to accommodate their effects, unlike the vertical alignment buttons, which require the user to heighten the rows. When you click the last Orientation button, Format Cells: Alignment, the aforementioned Format Cells dialog box appears, with the Alignment tab in view (Figure 4 44): A CHECK constraint can also have multiple columns. In the context of the ClassGrades table, you can specify a set of valid letter grades and a range of valid integer values to denote classes. Rows with GradeLetter values outside the letter range or ClassID values outside of scope of valid numbers for classes can be rejected by a CHECK constraint. The following CREATE TABLE statement is from the Ch04CheckPKStudentGrades.sql file. The file s contents are exactly the same as for the CREATE TABLE statement in the preceding sample, except for one constraint. asp.net textbox barcode scanner Mobile 1D/2D Barcode Reader Using HTML5 and ASP . NET ...
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