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All Forums  SQL Server 2000 Forums  SQL Server Development (2000)  Random select based on weightage

Author  Topic  cookie Starting Member 1 Post Posted - 2001-01-19 : 13:07:47 Hi, We have an Ad server that dishes out campaign ads based on a user's profile data(such as occupation, age, country etc) when that user logs in to a site. The capaigns are stored in a table with various fields such as occupation, age,coutry etc. The following procedure calculates the weightage for each campaign based on the above criteria and returns a resultset which is something like campaign A 3 campaign B 5 campaign C 7 .... The procedure is something like DECLARE @Occupation varchar(50), @Age varchar(50), @Income varchar(50), @State varchar(50), @Country varchar(50), @Category varchar(50), @URL varchar(50) #### These are going to be the user's profile data which is passed to the procedure SET @Occupation = '' SET @Age = '' SET @Income = '' SET @State = '' SET @Country = '' SET @Category = 'Gambling' SET @URL = '' SELECT Campaign, ( (CASE Occupation WHEN @Occupation THEN 1 ELSE 0 END)+ (CASE Age WHEN @Age THEN 1 ELSE 0 END)+ (CASE Income WHEN @Income THEN 1 ELSE 0 END)+ (CASE State WHEN @State THEN 1 ELSE 0 END)+ (CASE Country WHEN @Country THEN 1 ELSE 0 END)+ (CASE Category WHEN @Category THEN 1 ELSE 0 END)+ (CASE URL WHEN @URL THEN 1 ELSE 0 END) ) AS Weight FROM Campaign WHERE ( datebegin < GETDATE() AND dateend > GETDATE() ) OR Occupation = '' OR Age = '' OR Income = '' OR State = '' OR Country = '' OR Category = 'Gambling' OR URL = '' ORDER BY Weight The CASE statements handle the weighting of the records. We need to be able to utilize that weight to create a percentage chance of one of those records to be selected. i.e we need to modify this SQL statement to one where one of the records is chosen randomly based on the total weightage calulated Thanks in advance Sangeetha