Pull data from two tables and provide all data elements - sql

Question

I have one table that I created with Names, SSN, and dates. I want to look inside another table and still pull all the info from my first table, but also if the name is found in the second table, provide that data. If not, provide a Null Value. I believe this is a left join, but may be mistaken.
This is my code:
if object_id('tempdb..#ssns') is not null drop table #ssns
create table #ssns
(ssnId int, fName varchar(50), ssn varchar(20), ReqDate datetime2(0))
insert into #ssns values (1,'test,test','0001','20180621'),
if object_id('tempdb..#pt') is not null drop table #pt
select a.*, b.patientSID, b.patientName, b.patientSSN, b.DeathDateTime
into #pt
from #ssns a
join spatient.spatient b on b.patientname = a.fname
where b.sta3n = 558 and RIGHT(b.patientSSN,4) = a.ssn
if object_id('tempdb..#ptappt') is not null drop table #ptappt
select a.*, c.locationName, d.stopCode, b.appointmentDateTime, b.appointmentStatus
into #ptappt
from #pt a
left join LSV.D01_VISN06.cci_Appt_Appointment b on b.patientSID = a.patientSID and b.sta3n = 558
join dim.location c on c.locationSID = b.locationSID and c.sta3n = 558
join dim.stopCode d on d.stopCodeSID = c.primaryStopCodeSID and d.sta3n = 558
where isnull(b.AppointmentStatus,'Null') not in ('C', 'CA')
and appointmentDateTime >= a.reqDate
and d.stopCode in ('323', '322', '350')

Answer 1

I found my answer. You filter the where clause on the join:
from #pt a
left join LSV.D01_VISN06.cci_Appt_Appointment b on b.patientSID = a.patientSID and b.sta3n = 558 and
isnull(b.AppointmentStatus,'Null') not in ('C', 'CA')
and appointmentDateTime >= a.reqDate
left join dim.location c on c.locationSID = b.locationSID and c.sta3n = 558
left join dim.stopCode d on d.stopCodeSID = c.primaryStopCodeSID and d.sta3n = 558
and d.stopCode in ('323', '322', '350')