Changes between Version 1 and Version 2 of Normalization

Timestamp:

05/06/24 21:41:43 (8 months ago)

Author:

212012

Comment:

--

Normalization

@@ -1 +1 @@
 = Нормализација и подобрувања на дизајнот на базата
 
-==
+== Определување функциски зависности и да нема нешто со исто име на атрибут
+
+*s_id = statement_id 
+
+R = { pe_id, first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality, o_badge_no, o_password, o_date_of_employment, p_id, p_address, s_id, city, p_date_of_employment, badge_no, rank, p_password, statement_id, statement_date, description, incident_timestamp, incident_place, e_id, e_name, e_type, is_found, e_picture, c_id, c_name, opening_date, c_status, date_of_closing, sc_description, final_document, t_id, t_name }
+
+pe_id -> first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality \\
+o_badge_no -> pe_id, o_password, o_date_of_employment \\
+p_id -> p_address, o_badge_no, s_id \\
+s_id -> city \\
+badge_no -> pe_id, p_date_of_employment, rank, p_password, p_id \\
+statement_id -> statement_date, description, incident_timestamp, incident_place, e_id, badge_no \\
+e_id -> e_name, e_type, is_found, e_picture \\
+c_id -> c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing \\
+date_of_closing ->  sc_description, final_document \\
+t_id -> t_name \\
+
+\\
+Лево \\
+c_id
+
+Лево и десно \\
+pe_id, t_id, o_badge_no, p_id, s_id, badge_no, statement_id, e_id, date_of_closing, t_id
+
+Десно \\
+first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality, o_password, o_date_of_employment, p_address, city, p_date_of_employment, rank, p_password,statement_date, description, incident_timestamp, incident_place, e_name, e_type, 
+is_found, e_picture,c_name, opening_date, c_status, sc_description,
+final_document, t_name
+
+c_id+={ c_id, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, e_name, e_type, is_found, e_picture, t_name, p_address, o_badge_no, s_id, sc_description, final_document, city, pe_id, o_password, o_date_of_employment, p_date_of_employment, rank, p_password, first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality } \\
+Следува дека е единствен кандидат клуч и го прогласуваме за примарен клуч. 
+
+\\
+Во ваква дефинирана релација нема повеќекратни зависности, па со тоа следува дека задоволува **1НФ**. \\
+Клучот на релацијата е составен само од еден атрибут c_id, што значи дека парцијална зависност не постои, и со тоа заклучуваме дека е задоволена **2НФ**. \\
+Не е во 3НФ бидејќи има транзитивни зависности, пример s_id -> city
+
+Декомпозиција:
+
+**R1{__s_id__, city} е во BCNF**
+
+R2{__c_id__, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, e_name, e_type, is_found, e_picture, t_name, p_address, o_badge_no, s_id, sc_description, final_document, pe_id, o_password, o_date_of_employment, p_date_of_employment, rank, p_password, first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality} 
+
+R2 не е во 3НФ поради e_id -> e_name, e_type, is_found, e_picture
+
+**R21{__e_id__, e_name, e_type, is_found, e_picture } е во BCNF**
+
+R22{__c_id__, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, t_name, p_address, o_badge_no, s_id, sc_description, final_document, pe_id, o_password, o_date_of_employment, p_date_of_employment, rank, p_password, first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality}
+
+R22 не е во 3НФ поради t_id -> t_name
+
+**R221{t_id, t_name} е во BCNF**
+
+R222{c_id, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, p_address, o_badge_no, s_id, sc_description, final_document, pe_id, o_password, o_date_of_employment, p_date_of_employment, rank, p_password, first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality}
+
+R222 не е во BCNF поради pe_id -> first_name, last_name, gender, address, picture, contact, embg, date_of_birth,country, nationality}
+
+**R2221{__pe_id__, first_name, last_name, gender, address, picture, contact, embg, date_of_birth,country, nationality}е во BCNF**
+
+R2222{__c_id__, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, p_address, o_badge_no, s_id, sc_description, final_document, pe_id, o_password, o_date_of_employment, p_date_of_employment, rank, p_password}
+
+R2222 не е во BCNF поради date_of_closing ->  sc_description, final_document
+
+**R22221{__date_of_closing__, sc_description, final_document}е во BCNF**
+
+R22222{c_id, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, p_address, o_badge_no, s_id, pe_id, o_password, o_date_of_employment, p_date_of_employment, rank, p_password}
+
+R22222 не е во 3НФ поради o_badge_no -> pe_id, o_password, o_date_of_employment 
+
+**R222221{__o_badge_no__, pe_id, o_password, o_date_of_employment}е во BCNF**
+
+R222222{__c_id__, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, p_address, o_badge_no, s_id, p_date_of_employment, rank, p_password}
+
+R222222 не е во 3НФ поради badge_no -> pe_id, p_date_of_employment, rank, p_password, p_id
+
+**R2222221{__badge_no__, pe_id, p_date_of_employment, rank, p_password, p_id} е во BCNF**
+
+R2222222{__c_id__, c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing, statement_date, description, incident_timestamp, incident_place, badge_no, p_address, o_badge_no, s_id}
+
+R2222222 не е во BCNF поради statement_id -> statement_date, description, incident_timestamp, incident_place, e_id, badge_no
+
+**R22222221{__statement_id__, statement_date, description, incident_timestamp, incident_place, e_id, badge_no} е во BCNF**
+
+R22222222{__c_id__, c_name, opening_date, c_status, statement_id, t_id, p_id, date_of_closing, p_address, o_badge_no, s_id}
+
+R22222222 не е во BCNF поради p_id -> p_address, o_badge_no, s_id
+
+**R222222221{__p_id__, p_address, o_badge_no, s_id} е во BCNF**
+
+**R222222222{__c_id__, c_name, opening_date, c_status, statement_id, t_id, date_of_closing} тука завршуваме бидејќи е во BCNF.**
+
+== Релации
+**R1 = Statement{__s_id__, city}** 
+
+**R21 = Evidence{__e_id__, e_name, e_type, is_found, e_picture} е во BCNF**
+
+**R221 = Type_of_crime{__t_id__, t_name} е во BCNF**
+
+**R2221=People{__pe_id__, first_name, last_name, gender, address, picture, contact, embg, date_of_birth,country, nationality}е во BCNF**
+
+**R22221 = Solved_case{__date_of_closing__, sc_description, final_document}е во BCNF**
+
+**R222221 = Officer{__o_badge_no__, pe_id, o_password, o_date_of_employment}е во BCNF**
+
+**R2222221 = Policeman{__badge_no__, pe_id, p_date_of_employment, rank, p_password, p_id} е во BCNF**
+
+**R22222221 = Statement{__statement_id__, statement_date, description, incident_timestamp, incident_place, e_id, badge_no} е во BCNF**
+
+**R222222221 = Police_Station{__p_id__, p_address, o_badge_no, s_id} е во BCNF**
+
+**R222222222 = Crime_case{__c_id__, c_name, opening_date, c_status, statement_id, t_id, date_of_closing} тука завршуваме бидејќи е во BCNF.**