explain the process and logic SCHEMA job_current contact_id 0- title salary start_date profession prof_id 0 profession zip_code

explain the process and logic 

SCHEMA

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job_current contact_id 0- title salary start_date profession prof_id 0 profession zip_code zip_code 0- city state status status_id 0- status job_desired contact_id 0- title salary_low salary_high available years_exp my_contacts contact_id last_name first_name phone email gender birthday prof_id zip_code status_id job_listings job_id title salary zip description contact_interest contact_id 0+x interest_id 0+ contact_seeking contact_id a 0+ seeking_id 0+x interests interest_id 0- interest seeking -seeking_id 0 seeking job_current contact_id 0- title salary start_date profession prof_id 0 profession zip_code zip_code 0- city state status status_id 0- status job_desired contact_id 0- title salary_low salary_high available years_exp my_contacts contact_id last_name first_name phone email gender birthday prof_id zip_code status_id job_listings job_id title salary zip description contact_interest contact_id 0+x interest_id 0+ contact_seeking contact_id a 0+ seeking_id 0+x interests interest_id 0- interest seeking -seeking_id 0 seeking