Changes between Version 2 and Version 3 of Normalization


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Timestamp:
06/14/24 18:11:57 (5 months ago)
Author:
212012
Comment:

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  • Normalization

    v2 v3  
    11= Нормализација и подобрувања на дизајнот на базата
    22
    3 == Определување функциски зависности и да нема нешто со исто име на атрибут
    4 
    5 *s_id = statement_id
    6 
    7 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 }
    8 
    9 pe_id -> first_name, last_name, gender, address, picture, contact, embg, date_of_birth, country, nationality \\
    10 o_badge_no -> pe_id, o_password, o_date_of_employment \\
    11 p_id -> p_address, o_badge_no, s_id \\
    12 s_id -> city \\
    13 badge_no -> pe_id, p_date_of_employment, rank, p_password, p_id \\
    14 statement_id -> statement_date, description, incident_timestamp, incident_place, e_id, badge_no \\
    15 e_id -> e_name, e_type, is_found, e_picture \\
    16 c_id -> c_name, opening_date, c_status, statement_id, e_id, t_id, p_id, date_of_closing \\
    17 date_of_closing ->  sc_description, final_document \\
    18 t_id -> t_name \\
    19 
    20 \\
    21 Лево \\
    22 c_id
    23 
    24 Лево и десно \\
    25 pe_id, t_id, o_badge_no, p_id, s_id, badge_no, statement_id, e_id, date_of_closing, t_id
    26 
    27 Десно \\
    28 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,
    29 is_found, e_picture,c_name, opening_date, c_status, sc_description,
    30 final_document, t_name
    31 
    32 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 } \\
    33 Следува дека е единствен кандидат клуч и го прогласуваме за примарен клуч.
    34 
    35 \\
    36 Во ваква дефинирана релација нема повеќекратни зависности, па со тоа следува дека задоволува **1НФ**. \\
    37 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**. \\
    38 Не е во 3НФ бидејќи има транзитивни зависности, пример s_id -> city
    39 
    40 Декомпозиција:
    41 
    42 **R1{__s_id__, city} е во BCNF**
    43 
    44 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}
    45 
    46 R2 не е во 3НФ поради e_id -> e_name, e_type, is_found, e_picture
    47 
    48 **R21{__e_id__, e_name, e_type, is_found, e_picture } е во BCNF**
    49 
    50 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}
    51 
    52 R22 не е во 3НФ поради t_id -> t_name
    53 
    54 **R221{t_id, t_name} е во BCNF**
    55 
    56 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}
    57 
    58 R222 не е во BCNF поради pe_id -> first_name, last_name, gender, address, picture, contact, embg, date_of_birth,country, nationality}
    59 
    60 **R2221{__pe_id__, first_name, last_name, gender, address, picture, contact, embg, date_of_birth,country, nationality}е во BCNF**
    61 
    62 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}
    63 
    64 R2222 не е во BCNF поради date_of_closing ->  sc_description, final_document
    65 
    66 **R22221{__date_of_closing__, sc_description, final_document}е во BCNF**
    67 
    68 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}
    69 
    70 R22222 не е во 3НФ поради o_badge_no -> pe_id, o_password, o_date_of_employment
    71 
    72 **R222221{__o_badge_no__, pe_id, o_password, o_date_of_employment}е во BCNF**
    73 
    74 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}
    75 
    76 R222222 не е во 3НФ поради badge_no -> pe_id, p_date_of_employment, rank, p_password, p_id
    77 
    78 **R2222221{__badge_no__, pe_id, p_date_of_employment, rank, p_password, p_id} е во BCNF**
    79 
    80 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}
    81 
    82 R2222222 не е во BCNF поради statement_id -> statement_date, description, incident_timestamp, incident_place, e_id, badge_no
    83 
    84 **R22222221{__statement_id__, statement_date, description, incident_timestamp, incident_place, e_id, badge_no} е во BCNF**
    85 
    86 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}
    87 
    88 R22222222 не е во BCNF поради p_id -> p_address, o_badge_no, s_id
    89 
    90 **R222222221{__p_id__, p_address, o_badge_no, s_id} е во BCNF**
    91 
    92 **R222222222{__c_id__, c_name, opening_date, c_status, statement_id, t_id, date_of_closing} тука завршуваме бидејќи е во BCNF.**
    93 
    94 == Релации
    95 **R1 = Statement{__s_id__, city}**
    96 
    97 **R21 = Evidence{__e_id__, e_name, e_type, is_found, e_picture} е во BCNF**
    98 
    99 **R221 = Type_of_crime{__t_id__, t_name} е во BCNF**
    100 
    101 **R2221=People{__pe_id__, first_name, last_name, gender, address, picture, contact, embg, date_of_birth,country, nationality}е во BCNF**
    102 
    103 **R22221 = Solved_case{__date_of_closing__, sc_description, final_document}е во BCNF**
    104 
    105 **R222221 = Officer{__o_badge_no__, pe_id, o_password, o_date_of_employment}е во BCNF**
    106 
    107 **R2222221 = Policeman{__badge_no__, pe_id, p_date_of_employment, rank, p_password, p_id} е во BCNF**
    108 
    109 **R22222221 = Statement{__statement_id__, statement_date, description, incident_timestamp, incident_place, e_id, badge_no} е во BCNF**
    110 
    111 **R222222221 = Police_Station{__p_id__, p_address, o_badge_no, s_id} е во BCNF**
    112 
    113 **R222222222 = Crime_case{__c_id__, c_name, opening_date, c_status, statement_id, t_id, date_of_closing} тука завршуваме бидејќи е во BCNF.**
     3[wiki:Version1 Верзија 1]
     4[wiki:Version2 Верзија 2]