Populating Fact Tables(Data Warehouse) and Querying - psql

Question

I am not sure how to query my fact tables(covid and vaccinations), I populated the dimensions with dummy data, I am supposed to leave the fact tables empty? As far as I know, they would get populated when I write the queries.
I am not sure how to query the tables I have tried different things, but I get an empty result.
Below is a link to the schema.
I want to find out the "TotalDeathsUK"(fact table COVID) for the last year caused by each "Strain"(my strain table has 3 strain in total.

Answer 1

You can use MERGE to poulate your fact table COVIDFact :
MERGE
INTO factcovid
using (
SELECT centerid,
dateid,
patientid,
strainid
FROM yourstagingfacttable ) AS f
ON factcovid.centerid = f.centerid AND factcovid.dateid=f.dateid... //the join columns
WHEN matched THEN
do nothing WHEN NOT matched THEN
INSERT VALUES
(
f.centerid,
f.dateid,
f.patientid,
f.strainid
)
And for VaccinationsFact :
MERGE
INTO vaccinations
using (
SELECT centerid,
dateid,
patientid,
vaccineid
FROM yourstagingfacttable ) AS f
ON factcovid.centerid = f.centerid //join condition(s)
WHEN matched THEN
do nothing WHEN NOT matched THEN
INSERT VALUES
(
f.centerid,
f.dateid,
f.patientid,
f.vaccineid
)
For the TotalDeathUK measure :
SELECT S.[Name] AS Strain, COUNT(CF.PatientID) AS [Count of Deaths] FROM CovidFact AS CF
LEFT JOIN Strain AS S ON S.StrainID=CF.StrainID
LEFT JOIN Time AS T ON CF.DateID=T.DateID
LEFT JOIN TreatmentCenter AS TR ON TR.CenterID=CF.CenterID
LEFT JOIN City AS C ON C.CityID = TR.CityID
WHERE C.Country LIKE 'UK' AND T.Year=2020
AND Result LIKE 'Death' // you should add a Result column to check if the Patient survived or died
GROUP BY S.[Name]