10 | | - USER (**__user_id__**, **user_name**, **user_surename**, **username**, **password**, **role**) |
11 | | - LABEQUIPMENT (__**equipment_id__**, **equipment_name**, type, description, safety_info) |
12 | | - ELEMENT (__**element_id__**, **symbol**, **element_name**,**atomic_number**, **atomic_weight**, melting_point,boiling_point,hazzard_type,description_element) |
13 | | - REACTION (__**reaction_id__**, **element1_id*** (ELEMENT), **element2_id*** (ELEMENT), product,conditions) |
14 | | - EXPERIMENT(__**experiment_id**__, **user_id*** (USER), **reaction_id*** (REACTON),result,time_stamp,safety_warning) |
| 10 | - USER (**__user_id__**, **user_name**, **user_surename**, **email**, **password**, **role**) |
| 11 | - STUDENT (**__student_id__*** (USER), **teacher_id*** (TEACHER)) |
| 12 | - TEACHER (**__teacher_id__*** (USER)) |
| 13 | - LABEQUIPMENT (__**equipment_id__**, **equipment_name**, type, description, safety_info, **teacher_id*** (TEACHER) ) |
| 14 | - ELEMENT (__**element_id__**, **symbol**, **element_name**,**atomic_number**, **atomic_weight**, melting_point,boiling_point,hazzard_type,description_element, **teacher_id*** (TEACHER)) |
| 15 | - REACTION (__**reaction_id__**, **teacher_id*** (TEACHER) **element1_id*** (ELEMENT), **element2_id*** (ELEMENT), product,conditions) |
| 16 | - EXPERIMENT(__**experiment_id**__, **teacher_id*** (TEACHER), **reaction_id*** (REACTON),result,time_stamp,safety_warning) |