Large Keyword Search

Apr 11, 2005

I’m working on a project that will allow a user to search through approx 100,000 records in a SQL table. Three of the columns are ‘text’ fields that hold paragraphs of text. The user interface has a ‘general search’ option so that they can enter a number of key words and the database will return a count of the records found containing the keywords.


At the moment I split the input and then build a query based on their input. For instance if they enter ‘hello world’ the input is split into two strings ‘hello’ and ‘world’. I then build the query in a loop and get a query like so:


Select Count(ID) as myCount FROM myTable WHERE (colOne like ‘%hello%’ AND colOne like ‘%world%’) OR (colTwo like ‘%hello%’ AND colTwo like ‘%world%’) OR (colThree like ‘%hello%’ AND colThree like ‘%world%’)


Unfortunately this query runs EXTREMELY slowly and just seems wrong. Is there a more efficient way I should be doing these types of searching? This method works ok on 100 records, but this is the first time I have worked on such a large database.


Is it also possible to search a text column and look for exact matches?


For instance I have 2 records with their textfield containing:


Rec 1: the news for today is blah blah. Rec 1: this is a new item


If I currently search for ‘new’ (select colID from myTable where colOne like ‘%new%’) I will get both these records, but I’d really only like to pull out the second record.


Any help would be great appreciated! :)
 

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Hi,

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Hi,

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Hii

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(

@SearchStr nvarchar(100)

)

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BEGIN

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SET NOCOUNT ON

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(

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)

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BEGIN

SET @ColumnName =

(

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FROM INFORMATION_SCHEMA.COLUMNS

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AND TABLE_NAME = PARSENAME(@TableName, 1)

AND DATA_TYPE IN ('char', 'varchar', 'nchar', 'nvarchar')

AND QUOTENAME(COLUMN_NAME) > @ColumnName

)



IF @ColumnName IS NOT NULL

BEGIN

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EXEC

(

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FROM ' + @TableName + ' (NOLOCK) ' +

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)

END

END

END

SELECT ColumnName, ColumnValue FROM #Results

END


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