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bOOSt PeRFORMance
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If you use a variable to set the simple term of the query, use a variable of data type nvarchar, not of data type varchar. If you use the varchar data type, SQL Server must perform an implicit conversion. Conversions limit query optimization techniques.
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The following code returns rows from the ProductDescription table that include the words safety, performance, or comfort. Each word is given a relative weight value, and the results are ordered from the highest-ranking match to the lowest:
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USE AdventureWorks2008 GO SELECT FT_Table.ProductDescriptionID, FT_Table.[Description] , KEY_TBL.RANK
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Extending Microsoft SQL Server Functionality with the Spatial, Full-Text Search, and Service Broker
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FROM Production.ProductDescription AS FT_Table INNER JOIN CONTAINSTABLE(production.ProductDescription, Description, 'ISABOUT (comfort weight (.8) , Safety weight (.5) , Performance weight(.2) )' ) AS KEY_TBL ON FT_Table.ProductDescriptionID = KEY_TBL.[KEY] ORDER BY KEY_TBL.RANK DESC;
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FREETEXT and FREETEXTTABLE
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The FREETEXT predicate allows you to write queries that return values that match the meaning of the search condition, not simply the exact words or synonyms of the search condition. The full-text query engine performs the following tasks when you execute a full-text query by using the FREETEXT predicate:
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Uses the word breaker to split the value of the string entered for the search condition into words. Uses stemming to create inflectional forms of the words created by the word breaker. Uses the thesaurus to locate additional expansions or replacements for the search terms.
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Column An individual column name, a list of columns separated by commas and enclosed within parentheses, or an asterisk (*) to designate all full-text columns. Free-text string Inputs the string to search for in the listed columns. If you enclose the string in double quotes, a phrase search is performed. With a phrase search, stemming and thesaurus lookups are not performed.
The FREETEXT command has the following arguments:
The language that is used for word breaking, stemming, stoplists, and thesaurus lookups.
Language
The FREETEXTTABLE command includes a combination of arguments from both the FREETEXT and CONTAINSTABLE commands. The FREETEXTTABLE command includes the Table, Column, Free-text string, Language, and Top-n-by-rank arguments as defined previously.
FREETEXT and FREETEXTTABLE Samples
The following command uses the FREETEXT predicate to return rows with descriptions that match the general meaning of the phrase provides a light stiff ride. The result set for this command returns 34 of the 762 rows in the ProductDescription table when a full-text index is built on the description column:
SELECT * FROM Production.ProductDescription WHERE FREETEXT(*,'provides a light stiff ride')
Lesson 2: Implementing Full-Text Search
In contrast, if you execute the following command, only one row is returned:
SELECT * FROM Production.ProductDescription WHERE CONTAINS(*,'"provides a light stiff ride"')
The following code uses the FREETEXTTABLE command to return rows with a meaning close to the input text. The full-text search engine assigns a rank based on how close the match is to the input phrase. The results are returned with the highest ranking rows listed first:
SELECT FT_TBL.ProductDescriptionID, FT_TBL.Description, KEY_TBL.RANK FROM Production.ProductDescription AS FT_TBL INNER JOIN FREETEXTTABLE (Production.ProductDescription, description, 'light stiff ride') AS KEY_TBL ON FT_TBL.ProductDescriptionID = KEY_TBL.[KEY] ORDER BY KEY_TBL.RANK DESC
Quick check
You need to write a query that returns all tenses of the verb write. Which generational term should you include in your query
Quick check answer
INFLECTIONAL
Pr actice
Writing Full-text Queries
In this practice, you execute queries against tables and columns in the AdventureWorks2008 database that have been enabled for full-text indexing.
e xercise 1
Review Full-Text Indexed Tables
In this exercise, you review the existing full-text indexes in the AdventureWorks2008 database.
1. 2.
Start SSMS (if it s not already started), connect to your SQL Server instance, and open a new query window. In the new query window, type and execute the following command to view the tables with populated full-text indexes:
USE AdventureWorks2008; GO
SELECT db_name(database_id) AS 'Database Name' , OBJECT_NAME(table_id) AS 'Table Name' FROM sys.dm_fts_index_population;
Review the result set and notice that full-text indexing has been enabled on the ProductReview, Document, and JobCandidate tables.
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note
inDeX On tHe PRODUCTDESCRIPTION tabLe
If you run the samples from the text, a full-text index also exists on the ProductDescription table.
4. 5.
If necessary, open Object Explorer by selecting Object Explorer from the View menu. In Object Explorer, expand the Databases node, expand AdventureWorks2008, expand Tables, right-click Production.ProductReview, select Full-Text Index, and then select Properties. In the Full-Text Index Properties window, in the Select A Page pane, click Columns. On the Columns page, note the columns that have been enabled for full-text indexing. Repeat steps 5 7 for the Production.Document and HumanResources. JobCandidate tables. Notice that the Document column of the Production.Document table has a Type Column value of FileExtension. This is because the document column has a varbinary(max) data type and the data must be interpreted by the appropriate filter defined by the file name extension included in the FileExtension column. All the files in the sample have the .doc extension and will be interpreted by the Microsoft Office Word filter. Leave SSMS open for the next exercise.
6. 7. 8.
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