SQL Logic for Latest record from results obtained - sql

Question

I have a query that I build that pulls back data from multiple tables for a particular location, particular appointment types in a schedule for a particular date range. In the data that is returned, I am pulling the provider of the service, the member who is getting the service and a number of fields that describe things about the member or service appointment. The information will be grouped by the provider. So you will have multiple members/client records per provider for that period.
What I am now being asked to do is to take those results and pull only the latest appointment for those results.
My code is as follows:
SELECT SCSERVICES.servicecode, SCSERVICES.servicename, SCSESSIONS.scheduleid, SCSERVICES.servicetype, SCSERVICECATEGORIES.servicecategory,
SCSCHEDULES.scheduledatefrom, MEMBERS.lname, MEMBERS.fname, SCSCHEDULES.timestart, SCSCHEDULES.schedulestatus,
CASE WHEN MEMBERS.phone1label = '4' THEN MEMBERS.phone1 WHEN MEMBERS.phone2label = '4' THEN MEMBERS.phone2 WHEN MEMBERS.phone3label = '4'
THEN MEMBERS.phone3 WHEN MEMBERS.phone4label = '4' THEN MEMBERS.phone4 END AS MobilePhone, MEMBERS.scancode,
EMPLOYEES.fname AS trainfname, EMPLOYEES.lname AS trainlname, MEMBERS.lastvisit
FROM SCSESSIONS INNER JOIN
SCSERVICES ON SCSESSIONS.serviceid = SCSERVICES.serviceid INNER JOIN
SCSERVICECATEGORIES ON SCSERVICES.servicecategoryid = SCSERVICECATEGORIES.servicecategoryid INNER JOIN
SCSCHEDULES ON SCSESSIONS.scheduleid = SCSCHEDULES.scheduleid INNER JOIN
MEMBERS ON SCSCHEDULES.memid = MEMBERS.memid INNER JOIN
SCSESSION_PROVIDERS ON SCSESSIONS.sessionid = SCSESSION_PROVIDERS.sessionid INNER JOIN
EMPLOYEES ON SCSESSION_PROVIDERS.employeeid = EMPLOYEES.employeeid
WHERE (SCSERVICECATEGORIES.servicecategory = 'Trainers' OR
SCSERVICECATEGORIES.servicecategory = 'Pilates' OR
SCSERVICECATEGORIES.servicecategory = 'Specialty') AND (SCSERVICES.siteid = #rvSite) AND (CAST(SCSCHEDULES.scheduledatefrom AS DATE) BETWEEN
#rvSessionDate AND #rvSessionDateEnd) AND (SCSCHEDULES.schedulestatus = '1') AND (SCSERVICES.servicecode <> 'BREAK')
Results look something like this:

Answer 1

you can use row_number function for that
( for latest scheduledatefrom for a member)
select * from (
SELECT SCSERVICES.servicecode
, SCSERVICES.servicename
, SCSESSIONS.scheduleid
, SCSERVICES.servicetype
, SCSERVICECATEGORIES.servicecategory
, SCSCHEDULES.scheduledatefrom
, MEMBERS.lname
, MEMBERS.fname
, SCSCHEDULES.timestart
, SCSCHEDULES.schedulestatus
, CASE
WHEN MEMBERS.phone1label = '4'
THEN MEMBERS.phone1
WHEN MEMBERS.phone2label = '4'
THEN MEMBERS.phone2
WHEN MEMBERS.phone3label = '4'
THEN MEMBERS.phone3
WHEN MEMBERS.phone4label = '4'
THEN MEMBERS.phone4
END AS MobilePhone
, MEMBERS.scancode
, EMPLOYEES.fname AS trainfname
, EMPLOYEES.lname AS trainlname
, MEMBERS.lastvisit
, row_number() over ( partition by MEMBERS.memid order by SCSCHEDULES.scheduledatefrom desc) rowid
FROM SCSESSIONS
INNER JOIN SCSERVICES
ON SCSESSIONS.serviceid = SCSERVICES.serviceid
INNER JOIN SCSERVICECATEGORIES
ON SCSERVICES.servicecategoryid = SCSERVICECATEGORIES.servicecategoryid
INNER JOIN SCSCHEDULES
ON SCSESSIONS.scheduleid = SCSCHEDULES.scheduleid
INNER JOIN MEMBERS
ON SCSCHEDULES.memid = MEMBERS.memid
INNER JOIN SCSESSION_PROVIDERS
ON SCSESSIONS.sessionid = SCSESSION_PROVIDERS.sessionid
INNER JOIN EMPLOYEES
ON SCSESSION_PROVIDERS.employeeid = EMPLOYEES.employeeid
WHERE (
SCSERVICECATEGORIES.servicecategory = 'Trainers'
OR SCSERVICECATEGORIES.servicecategory = 'Pilates'
OR SCSERVICECATEGORIES.servicecategory = 'Specialty'
)
AND (SCSERVICES.siteid = #rvSite)
AND (
CAST(SCSCHEDULES.scheduledatefrom AS DATE) BETWEEN #rvSessionDate
AND #rvSessionDateEnd
)
AND (SCSCHEDULES.schedulestatus = '1')
AND (SCSERVICES.servicecode <> 'BREAK')
) x
where rowid = 1