sql - How to populate data from a table, depending upon another table -

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my question super straight,

i have table naming faq_master having data of faqs

i have table naming faq_override having data of overrided faqs foreign key company_id different table

now want populate data faq_master, if faq_override not populating data depending upon company_id fetched session variable

if faq_override populating data, populating data faq_master not required.

i want run query in postresql

what have tried :

select          *              (              select              distinct fm.faq_uid faquid,              case                  when fm.qa_text not null fm.qa_text                  else fm.qa_text              end qatext,             case                  when fm.sort_order not null fm.sort_order                 else fm.sort_order              end sortorder,              fm.end_date enddate                rnr.faq_master fm          ) faq_qry          left outer join rnr.company_faq_override fo on faq_qry.faquid = fo.faq_override_uid , fo.mp_company_uid = 734                    faq_qry.enddate null           ,          (          faq_qry.mp_company_uid null or fo.mp_company_uid = 734          )             order           faq_qry.sortorder


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