Searching for Words or Phrases Using Weighted Values (Weighted Term)
You can use CONTAINS or CONTAINSTABLE to search for words or phrases and specify a weighting value. Weight, measured as a number from 0.0 through 1.0, indicates the degree of importance for each word and phrase within a set of words and phrases. A weight value of 0.0 is the lowest, and a weight value of 1.0 is the highest.
The following example shows a query that searches for all customer addresses, using weight values, in which any text beginning with the string "Bay" has either "Street" or "View". SQL Server 2008 gives a higher rank to those rows with more of the words specified.
USE AdventureWorks GO SELECT AddressLine1, KEY_TBL.RANK FROM Person.Address AS Address INNER JOIN CONTAINSTABLE(Person.Address, AddressLine1, 'ISABOUT ("Bay*", Street WEIGHT(0.9), View WEIGHT(0.1) ) ' ) AS KEY_TBL ON Address.AddressID = KEY_TBL.[KEY] ORDER BY KEY_TBL.RANK GO
A weighted term can be used in conjunction with any of the other four types of terms, namely simple term, prefix term, generation term, and proximity term.