Oracle Insert via Select from multiple tables where one table may not have a row

Question

I have a number of code value tables that contain a code and a description with a Long id.

I now want to create an entry for an Account Type that references a number

Answer 1

insert into account_type_standard (account_type_Standard_id, tax_status_id, recipient_id)
select account_type_standard_seq.nextval,
   ts.tax_status_id, 
   ( select r.recipient_id
     from recipient r
     where r.recipient_code = ?
   )
from tax_status ts
where ts.tax_status_code = ?