Awesome job posting consumable ddl and sample data!!!! I wish everyone would create posts like that. It really makes this easy to work with.
I am not quite sure what you are looking for but this matches your posted desired output.
select t.entity_id
, t.effective_date
, t.company_name
, t.last_accounts_date
, t2.s_code
, t2.s_code_description
, t2.ineffective_date
from Tab1 t
join tab2 t2 on t2.entity_id = t.entity_id
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