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Thesaurus files
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All thesaurus files are shipped empty. For thesaurus matches to work, these files must be populated. All thesaurus files are XML documents; you can find them in the $SQL_Server_Install_Path\ Microsoft SQL Server\MSSQL.1\MSSQL\FTDATA\ directory. For information about populating thesaurus files, see the SQL Server 2005 Books Online article Configuring Thesaurus Files.
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Word proximity is a common way of searching documents for multiple keywords or phrases. This type of query uses the NEAR (~) keyword. The closer words are to
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Lesson 4: Querying Data by Using a Full-Text Index
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each other, the better the match for these types of queries. The proximity is used as part of the RANK calculation for rows matching the search criteria. This keyword is rarely used with the CONTAINS predicate because the rank of matched results cannot be evaluated directly. The following two queries are equivalent to each other:
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SELECT ProductDescriptionID, Description FROM Production.ProductDescription WHERE CONTAINS(Description, N'mountain NEAR bike'); SELECT ProductDescriptionID, Description FROM Production.ProductDescription WHERE CONTAINS(Description, N'mountain ~ bike');
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As if all these options were not enough, you can also assign relative weights to particular search terms. This weighting affects the ranking score that the full-text optimizer returns by causing a particular term to be considered more or less significant. The WEIGHT clause, a value between 0.0 and 1.0, has no effect on queries that use CONTAINS, but it does affect the RANK value returned with CONTAINSTABLE. Because the AdventureWorks sample database deals with bikes, the following query uses weighting to place more emphasis on the word mountain than the word bike :
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SELECT Description FROM Production.ProductDescription WHERE CONTAINS(Description,'ISABOUT (mountain weight (.8), bike weight (.2) )' );
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Also note that you can use multiple keywords in a search. To specify multiple keywords, you separate the terms by the keywords AND, AND NOT, or OR to include or exclude rows.
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CONTAINSTABLE
The CONTAINSTABLE function has the same capabilities as the CONTAINS function. However, like the FREETEXTTABLE function, it returns a rowset that contains a RANK and a KEY column that can be used to return the best matches to a search. The general syntax for this function is the following:
CONTAINSTABLE ( table , { column_name | (column_list ) | * } , ' < contains_search_condition > ' [ , LANGUAGE language_term] [ ,top_n_by_rank ] )
21
Creating Full-Text Catalogs
Quick Check
What is the difference between the CONTAINS and FREETEXT functions FREETEXT is a less-precise way of querying full-text data because it automatically searches for all forms and synonyms of a word or words. CONTAINS allows a precise specification for a query, including the capability to search by word proximity, weighting, and complex pattern matching.
Quick Check Answer
PRACTICE
Query a Full-Text Index
In this practice, you execute a query by using the full-text indexes that you previously created. 1. If necessary, launch SSMS, connect to your instance, and open a new query window. 2. Execute the following batch:
SELECT ProductDescriptionID, Description FROM Production.ProductDescription WHERE CONTAINS(Description, 'alloy'); SELECT ProductDescriptionID, Description FROM Production.ProductDescription WHERE CONTAINS(Description, 'same');
3. Why does the first query return results, whereas the second query does not
Lesson Summary
SQL Server passes full-text queries to the full-text search engine, which routes search terms through the dedicated query processor for full-text queries. The full-text query processor provides extended capability for matching on derivatives as well as synonyms, making full-text searches powerful, flexible, and even capable of handling common word misspellings. You can use the FREETEXT and FREETEXTTABLE full-text functions to provide a general sampling of rows that might match the search argument. You use the CONTAINS and CONTAINSTABLE functions in production applications to allow for very precise criteria to target search results.
Lesson 4: Querying Data by Using a Full-Text Index
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which of the following is a valid option for a FREETEXT or FREETEXTTABLE query A. THESAURUS B. NEAR C. WEIGHT D. LANGUAGE
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