I am having the following issue with my query.
I am trying to import data from multiple tables (Fact_Contact, Quali_Seg, etc…) into one table (Fact_Forecast). This is to predict how many individuals are eligible for a specific offer. The problem I am having is that for some reason, the column Date_ID, which is been pulled from Fact_Contact, when importing has NULL values. I don't know where these NULL values are coming from as the table Fact_Contact don't have any NULL values in the column DATE_ID.
This is the section of the query that has the problem,
DECLARE @lastDateID int
SELECT TOP 1 @lastDateID = date_id
FROM Fact_Contact
ORDER BY CREATE_DATE DESC
SELECT date_id, Offers.Segmentation_id, Offers.Offer_Code, Offers.Wave_no,
Offers.cadencevalue,
CASE
WHEN dailydata.activity_count IS NOT NULL THEN dailydata.activity_count
ELSE 0
END as "activity_count"
FROM (
SELECT s.Segmentation_id, s.Offer_Code, s.Wave_no, o.cadencevalue,
o.campaign_id, o.offer_desc
FROM Forecast_Model.dbo.Quali_Segment s
LEFT JOIN Forecast_Model.dbo.Dim_Offers o
ON s.offer_code = o.offer_code
) Offers
LEFT JOIN (
SELECT date_id, Offer_Code_1 Offer_Code,
segmentation_group_id, Count(indv_role_id) Activity_count
FROM Forecast_Model.dbo.Fact_Contact
WHERE date_id = @lastDateID
GROUP BY offer_code_1,segmentation_group_id,date_id
) DailyData
ON DailyData.offer_code = Offers.offer_code
AND Offers.Segmentation_id = dailydata.segmentation_group_id
ORDER BY Segmentation_id,Wave_no
The column Date_ID as I mentiones gets only 2 dates which is the same as the @LastDateID which is 2014-05-20 but the rest are NULL.
Thank you, Omar
只要您在“报价”中有记录(加入Quali_Segment)但在Fact_Contact中没有匹配的记录,则date_id将为NULL
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