Redshift Fill In Missing Rows in Table A from Table B

Question

Please help. I am not sure if Redshift has an issue or if it is just me.

Table A has the below data:

Company_Name	Report_Type	Report_Number
Apple	Sales	123
Apple	Employees	804

Table B has the below data:

Report_Number	Report_Type
123	Sales
804	Employees
654	Inventory
	Revenue

I need the below output, ie to add missing report_types to Table A:

Company_Name	Report_Type	Report_Number
Apple	Sales	123
Apple	Employees	804
Apple	Inventory	654
Apple	Revenue

Answer 1

select t2.Company_Name , t1.Report_Type 
from (select distinct Report_Type from TableB) t1
cross join (select distinct Company_Name from tableA) t2
where not exists (select 1 from tableA t3 
                  where t3.Company_Name = t2.Company_Name 
                    and t3.Report_Type = t1.Report_Type
                  );