select user_course_id, process_percent, usr.user_nicename, usm.user_id, usm.meta_value as isim, usm2.meta_value as soyisim
from wpfj_stm_lms_user_courses krs
join wpfj_users usr on krs.user_id = usr.id
left join usm_table_name usm on krs.user_id = usm.user_id and usm.meta_key = 'first_name'
left join usm_table_name usm2 on krs.user_id = usm2.user_id and usm2.meta_key = 'last_name'