----------------------user----------------------------
user
user_id,user_name,user_pass,career_id
career
career_id,career_name
career_skill
career_id,skill_id
--------------------------skill---------------------------
skill
skill_id,skill_name,skill_description,skill_type_id
skill_type
skill_type_id,skill_type_name,skill_type_parent_id
user_skill
user_id,skill_id,skill_score
--------------------------course---------------------------
course
course_id,course_name,course_description
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