upc internet cz Microsoft SQL Server 2008 Internals in Visual Basic .NET

Creator UPC Code in Visual Basic .NET Microsoft SQL Server 2008 Internals

Microsoft SQL Server 2008 Internals
UPC Symbol Creation In VB.NET
Using Barcode generation for .NET Control to generate, create GTIN - 12 image in Visual Studio .NET applications.
www.OnBarcode.com
Scan UPCA In VB.NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
A nal comment about constraint errors and transactions: a single data modi cation statement (such as an UPDATE statement) that affects multiple rows is automatically an atomic operation, even if it s not part of an explicit transaction. If such an UPDATE statement nds 100 rows that meet the criteria of the WHERE clause but one row fails because of a constraint violation, no rows will be updated. I discuss implicit and explicit transactions a bit more in 10.
Drawing Bar Code In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create bar code image in .NET applications.
www.OnBarcode.com
Barcode Reader In Visual Basic .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
The Order of Integrity Checks
UCC - 12 Creator In C#.NET
Using Barcode creator for VS .NET Control to generate, create GS1 - 12 image in VS .NET applications.
www.OnBarcode.com
GTIN - 12 Generator In .NET Framework
Using Barcode generation for ASP.NET Control to generate, create Universal Product Code version A image in ASP.NET applications.
www.OnBarcode.com
The modi cation of a given row fails if any constraint is violated or if a trigger rolls back the operation. As soon as a failure in a constraint occurs, the operation is aborted, subsequent checks for that row aren t performed, and no triggers re for the row. Hence, the order of these checks can be important, as the following list shows: 1. Defaults are applied as appropriate. 2. NOT NULL violations are raised. 3. CHECK constraints are evaluated. 4. FOREIGN KEY checks of referencing tables are applied. 5. FOREIGN KEY checks of referenced tables are applied. 6. The UNIQUE and PRIMARY KEY constraints are checked for correctness. 7. Triggers re.
UPC Symbol Creation In VS .NET
Using Barcode printer for Visual Studio .NET Control to generate, create Universal Product Code version A image in Visual Studio .NET applications.
www.OnBarcode.com
Code128 Printer In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Code 128B image in Visual Studio .NET applications.
www.OnBarcode.com
Download at Wow! eBook
Print UPC A In VB.NET
Using Barcode printer for .NET Control to generate, create GS1 - 12 image in VS .NET applications.
www.OnBarcode.com
Painting PDF417 In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create PDF-417 2d barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Altering a Table
Encode Barcode In VB.NET
Using Barcode creation for .NET Control to generate, create bar code image in .NET applications.
www.OnBarcode.com
Print EAN8 In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create EAN-8 Supplement 5 Add-On image in .NET framework applications.
www.OnBarcode.com
SQL Server 2008 allows existing tables to be modi ed in several ways. Using the ALTER TABLE command, you can make the following types of changes to an existing table:
QR Code 2d Barcode Scanner In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Encoding DataMatrix In Objective-C
Using Barcode creator for iPad Control to generate, create Data Matrix 2d barcode image in iPad applications.
www.OnBarcode.com
Change the data type or the NULL property of a single column. Add one or more new columns, with or without de ning constraints for those columns. Add one or more constraints. Drop one or more constraints. Drop one or more columns. Enable or disable one or more constraints (applies only to CHECK and FOREIGN KEY constraints). Enable or disable one or more triggers. Rebuild a table or a partition to change the compression settings or remove fragmentation. (Fragmentation is discussed in 6, and compression is discussed in 7.) Change the lock escalation behavior of a table. (Locks and lock escalation are discussed in 10.)
Data Matrix Reader In VS .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Draw Code 39 Full ASCII In Objective-C
Using Barcode printer for iPad Control to generate, create USS Code 39 image in iPad applications.
www.OnBarcode.com
5
Generating EAN 13 In Java
Using Barcode creation for BIRT Control to generate, create EAN / UCC - 13 image in BIRT reports applications.
www.OnBarcode.com
Painting EAN / UCC - 13 In None
Using Barcode creation for Online Control to generate, create EAN-13 Supplement 5 image in Online applications.
www.OnBarcode.com
Tables
Decoding ECC200 In VB.NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Print Universal Product Code Version A In VS .NET
Using Barcode encoder for .NET Control to generate, create UPC-A Supplement 2 image in .NET framework applications.
www.OnBarcode.com
Changing a Data Type
By using the ALTER COLUMN clause of ALTER TABLE, you can modify the data type or the NULL property of an existing column. But be aware of the following restrictions:
The modi ed column can t be a text, image, ntext, or rowversion (timestamp) column. If the modi ed column is the ROWGUIDCOL for the table, only DROP ROWGUIDCOL is allowed; no data type changes are allowed. The modi ed column can t be a computed or replicated column. The modi ed column can t have a PRIMARY KEY or FOREIGN KEY constraint de ned on it. The modi ed column can t be referenced in a computed column. The modi ed column can t have the type changed to timestamp. If the modi ed column participates in an index, the only type changes that are allowed are increasing the length of a variable-length type (for example, varchar(10) to varchar(20)), changing nullability of the column, or both. If the modi ed column has a UNIQUE or CHECK constraint de ned on it, the only change allowed is altering the length of a variable-length column. For a UNIQUE constraint, the new length must be greater than the old length. If the modi ed column has a default de ned on it, the only changes that are allowed are increasing or decreasing the length of a variable-length type, changing nullability, or changing the precision or scale. The old type of the column should have an allowed implicit conversion to the new type. The new type always has ANSI_PADDING semantics if applicable, regardless of the current setting. If conversion of an old type to a new type causes an over ow (arithmetic or size), the ALTER TABLE statement is aborted.
Here s the syntax and an example of using the ALTER COLUMN clause of the ALTER TABLE statement:
SYNTAX: ALTER TABLE table-name ALTER COLUMN column-name { type_name [ ( prec [, scale] ) ] [COLLATE <collation name> ] [ NULL | NOT NULL ] | {ADD | DROP} {ROWGUIDCOL | PERSISTED} } EXAMPLE: /* Change the length of the emp_lname column in the employee table from varchar(15) to varchar(30) */ ALTER TABLE employee ALTER COLUMN emp_name varchar(30);
Copyright © OnBarcode.com . All rights reserved.