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Unique identifier for each batch.\nbat_name: Variable character string (up to 30 characters). Name of the batch.\ndomain\n\ndom_id: Integer, primary key. Unique identifier for each domain.\ndom_name: Variable character string (up to 30 characters). Name of the domain.\nprofessional\n\nprof_id: Integer, primary key. Unique identifier for each professional.\nprof_name: Variable character string (up to 30 characters). Name of the professional.\nsalary\n\nsal_id: Integer, primary key. Unique identifier for each salary record.\nfee\n\nfee_id: Integer, primary key. Unique identifier for each fee record.\nmentor\n\nmen_id: Integer, primary key. Unique identifier for each mentor.\nmen_name: Variable character string (up to 50 characters). Name of the mentor.\nmen_email: Variable character string (up to 50 characters). Email of the mentor.\nbat_id: Integer, foreign key. References batch(bat_id).\nprof_id: Integer, foreign key. References professional(prof_id).\nsal_id: Integer, foreign key. 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