Lesson 1: Querying Data in .NET

Creator PDF-417 2d barcode in .NET Lesson 1: Querying Data

Lesson 1: Querying Data
Creating PDF-417 2d Barcode In Visual Studio .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create PDF-417 2d barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Decoding PDF 417 In Visual Studio .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
The following query shows how to produce the average number of vacation hours for all salaried and nonsalaried employees in the Employee table in a single output row:
Bar Code Creation In .NET Framework
Using Barcode printer for .NET framework Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Recognize Barcode In Visual Studio .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
SELECT [0], [1] FROM ( SELECT SalariedFlag, VacationHours FROM HumanResources.Employee ) AS H PIVOT ( AVG(VacationHours) FOR SalariedFlag IN ([0], [1]) ) AS Pvt
Painting PDF-417 2d Barcode In C#
Using Barcode generator for VS .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
www.OnBarcode.com
Printing PDF417 In .NET
Using Barcode creator for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
www.OnBarcode.com
In this example, the data from the Employee table is first selected in the derived table called H. The data from the table is pivoted using the AVG aggregate to produce two columns 0 and 1 each corresponding to one of the two salary types in the Employee table. Note that the same identifiers used to define the pivot columns must also be used in the SELECT list if you want to return the columns values to the user. The UNPIVOT operator does the exact opposite of the PIVOT operator. It turns columns back into rows. This operator is useful when you are normalizing tables that have more than one column of the same type defined.
PDF-417 2d Barcode Creator In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create PDF417 image in .NET applications.
www.OnBarcode.com
Create UPC-A Supplement 2 In .NET Framework
Using Barcode maker for .NET framework Control to generate, create Universal Product Code version A image in .NET framework applications.
www.OnBarcode.com
Creating Queries That Use Full-Text Search
Barcode Generator In Visual Studio .NET
Using Barcode creation for .NET Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Printing PDF417 In .NET Framework
Using Barcode encoder for Visual Studio .NET Control to generate, create PDF417 image in .NET applications.
www.OnBarcode.com
If your database contains many columns that use string data types such as VARCHAR or NVARCHAR, you might find that searching these columns for data by using the Transact-SQL = and LIKE operators does not perform well. A more efficient way to search text data is to use the SQL Server FTS capabilities. To do full-text searching, you first must enable full-text indexes for the tables you want to query. To query a full-text index, you use a special set of functions that differ from the operators that you use to search other types of data. The main functions for full-text search are CONTAINS and FREETEXT. The CONTAINS function searches for exact word matches and word prefix matches. For instance, the following query can be used to search for any address containing the word Stone :
Generate Data Matrix ECC200 In .NET
Using Barcode generation for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in VS .NET applications.
www.OnBarcode.com
4-State Customer Barcode Generation In .NET
Using Barcode generation for .NET framework Control to generate, create USPS OneCode Solution Barcode image in .NET applications.
www.OnBarcode.com
SELECT * FROM Person.Address WHERE CONTAINS(AddressLine1, 'Stone')
USS Code 39 Generator In Objective-C
Using Barcode drawer for iPhone Control to generate, create Code 39 Full ASCII image in iPhone applications.
www.OnBarcode.com
Scan QR In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
5
PDF417 Recognizer In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Barcode Creation In None
Using Barcode creation for Font Control to generate, create barcode image in Font applications.
www.OnBarcode.com
Working with Transact-SQL
Code 39 Generation In None
Using Barcode generation for Office Word Control to generate, create USS Code 39 image in Office Word applications.
www.OnBarcode.com
Decode GS1 - 12 In VB.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
This query would find an address at 1 Stone Way , but to match 23 Stoneview Drive you need to add the prefix identifier, *, as in the following example:
Read Bar Code In Visual C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Barcode Drawer In Visual Basic .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications.
www.OnBarcode.com
SELECT * FROM Person.Address WHERE CONTAINS(AddressLine1, '"Stone*"')
Note that you must also use double quotes if you use the prefix identifier. If the double quotes are not included, the string will be searched as an exact match, including the prefix identifier. If you need a less-exact match, use the FREETEXT function instead. This function uses a fuzzy match to get more results when the search term is inexact. For instance, the following query would find an address at 1 Stones Way , even though the search string Stone is not exact:
SELECT * FROM Person.Address WHERE FREETEXT(AddressLine1, 'Stone')
FREETEXT works by generating various forms of the search term, breaking single words into parts as they might appear in documents and generating possible synonyms using thesaurus functionality. This predicate is useful when you want to let users search based on the term s meaning, rather than only exact strings. Both CONTAINS and FREETEXT also have table-valued versions: CONTAINSTABLE and FREETEXTTABLE, respectively. The table-valued versions have the added benefit of returning additional data along with the results, including the rank of each result in a column called RANK. The rank is higher for closer matches, so you can order results for users based on relevance. You can join to the result table by using the generic KEY column, which joins to whatever column in your base table was used as the unique index when creating the full-text index.
MORE INFO
Creating full-text indexes
For information on creating full-text indexes, see the CREATE FULLTEXT INDEX (Transact-SQL) topic in SQL Server 2005 Books Online.
Lesson 1: Querying Data
Quick Check
Which function should you use to query exact or prefix string matches The CONTAINS function lets you query either exact matches or matches based on a prefix.
Copyright © OnBarcode.com . All rights reserved.