SQL Server: combine only dates with no reference - sql

Question

I have a data such as
Table 1: (after converting data into the format I need with the below query later in this question after the left join)
Initially has details of tickets such as date, ticket number, ticket type.
Monthyear Premiumold Silverold
-----------------------------------
Jan 2019 233 156
Feb 2019 344 258
Mar 2019 222 298
Table 2: which I predicted and pushed from a different source in the same format
Monthyear Premium silver
----------------------------
Apr 2019 284 312
May 2019 267 344
Jun 2019 223 356
Jul 2019 244 367
Aug 2019 234 373
I want to get this data to be in a format such as:
Monthyear Premiumold Silverold Premium silver
---------------------------------------------------------
Jan2019 233 156 NULL NULL
Feb 2019 344 258 NULL NULL
Mar 2019 222 298 NULL NULL
Apr 2019 NULL NULL 284 312
May 2019 NULL NULL 267 344
Jun 2019 NULL NULL 223 356
Jul 2019 NULL NULL 244 367
Aug 2019 NULL NULL 234 373
which basically puts the months together and leaves out NULL in wherever data isn't present for.
I have tried:
select *
from
((select Monthyear, Premium, Silver
from [dbo].[Predicted]) c
left join
(select
case when (tickettype = 'Premium')
then count(number)
end as Premiumold,
case when (tickettype = 'Silver')
then count(number)
end as Silverold,
concat(convert(char(3), a.date, 0), ' ', year(a.date)) as Monthyear
from
openquery(SNOW, 'select number,date, ticket_type from ticketdata
where date between ''2019-01-01 00:00:00'' and ''2019-02-28 23:59:59''')a
group by concat(convert(char(3), a.sys_created_on, 0),' ',year(a.date)),tickettype) as b
on c.Monthyear = b.Monthyear)
This obviously isn't returning what I want.
Please help me with this.
Thanks!

Answer 1

Try this.
select ISNULL(a.monthyear,b.monthyear),a.Premiumold,silverold,Premium,silver from Table1 a
full join Table2 b on a.monthyear=b.MonthYear

Answer 2

use union all
select Monthyear,Premiumold,Silverold, null as Premium, null as silver
from tabl1
union all
select Monthyear,null,null,Premium,silver from tabl2