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AskSQLTeam
Ask SQLTeam Question
0 Posts |
 Posted - 2001-01-24 : 13:05:41
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Sangeetha writes "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 campaigns 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
....
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" |
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Random search of campaigns for an Ad server