How to transform SQL code into a measure? - ms-access

Question

Right now i am using 3 CSV files ( appointment, Person and Referral ) to calculate what i have called as KPI4, KPI5 and KPI6.
I import them into an Access Database that run some SQL queries. I want to automate this proces a bit and create a measure for these KPI's and just upload/update the 3 csv files and the POWER BI report just get updated.
For example for KPI4 I have the following SQL's queries
First and the main one but which refers to z_KPI8_part1 :
SELECT
Person.LPTID, Person.ccgName, Person.Caseload, t1.FTDate,
t1.SERVICEID, Person.LTCondition, Referral.Caseload, *
FROM
Person
INNER JOIN ((SELECT SERVICEID,FTDate
FROM z_KPI8_part1) AS t1
INNER JOIN Referral
ON t1.SERVICEID = Referral.SERVICEID)
ON Person.LPTID = Referral.LPTID;
z_KPI8_part1 which referrs to z_FirstTreatmentDate :
SELECT
z_FirstTreatmentDate.SERVICEID, Min(z_FirstTreatmentDate.FTDate) AS FTDate,
Max(Appointment.ATTENDANCE) AS ATTENDANCE
FROM
Appointment
INNER JOIN z_FirstTreatmentDate
ON (Appointment.SERVICEID = z_FirstTreatmentDate.SERVICEID) AND
(Appointment.Appointment = z_FirstTreatmentDate.FTDate)
WHERE
(((z_FirstTreatmentDate.FTDate) Between [forms]![frmMain]![txtFTDateFrom] And
[forms]![frmMain]![txtFTDateTo]))
GROUP BY
z_FirstTreatmentDate.SERVICEID;
z_FirstTreatmentDate :
SELECT
Appointment.SERVICEID, Min(Appointment.APPOINTMENT) AS FTDate,
Min(Appointment.APPTYPE) AS APPTYPE
FROM
(SELECT *
FROM Appointment
WHERE
(Appointment.APPTYPE=02 OR Appointment.APPTYPE=03 OR Appointment.APPTYPE=05) AND
(Appointment.ATTENDANCE='5' OR Appointment.ATTENDANCE='6')
) AS [%$###_Alias]
GROUP BY
Appointment.SERVICEID;
In theory KPI4 is First Appointment Date when client's Session Type ( APPTYPE )is one of the following: 2,3,5
And
Attendance Status is one of the following: 5 and 6.
From my method i am not getting anywhere near the numbers i get from Access database.
Please help me or guide me