Ch4 Relational Mapping

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you_ren

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步驟一：將各個實體畫出，並加上屬性，並將主鍵標為 PK ( 組合屬性為 Name 、 Fname 、 Minit 、 Lname ，則 Name 不需要加上去，如上所示 ) Employee Ssn Bdate Name Fname Minit Lname Address Salary Sex Employee Eependents_of Dependents_of 1 N Name Sex Birth_date Relationship PK Supervision 1 Supervisor N Superises Sex Salary Address Bdate Ssn Lname Minit Fname

Employee FK PK 步驟二：將弱實體前，加上強實體的主鍵，成為外來鍵步驟三：下頁說明->為了配合圖形，先說明步驟四步驟四：若有 1:N 時，將 1 那邊實體的主鍵，加到 N 那邊成為外來鍵 ( 若是遞迴關係，則將主鍵從新命名，原因：為了避免在同一個欄位出現兩個相同的 ssn) FK PK PK ( 因此原本是 ssn ，從新命名後變成 Super_ssn) Employee Dependent 請參考前一頁投影片上的 ER 圖 Sex Salary Address Bdate Ssn Lname Minit Fname Relationship Birth_date Sex Name Employee_ssn Super_ssn Sex Salary Address Bdate Ssn Lname Minit Fname

Department Name Locations Number Manages 1 1 步驟三： 1 對 1 時，將任一個實體的主鍵加到另一邊上，成為外來鍵 PS ：若是如上圖所以，有一邊是完全參予的話，則將 1 條線上實體的主鍵，加到 2 條線時那邊成為外來鍵 PK FK Department 如上圖，將 employee 的主鍵放到 department 當外來鍵 Number Name Employee_ssn

[object Object],Works_on Project N M Location Number Name Hours Works_on FK Project FK PK Hours Project_name Employee_ssn

Locations 步驟六：如下圖，將多值屬性再創一個關連表，且把自身當成外來鍵 ( 例： Locations_ 名稱 ) ，再加上原實體的主鍵形成外來鍵，兩個外來鍵合成一個主鍵 R1 E1 E2 E3 e1 e2 e3 r1 步驟七：如上圖多元關係，將關係轉變成新的關聯表，並將關係上連結的實體的主鍵放上去變成外來鍵，外來鍵加起來就是主鍵 FK FK PK Locations_ 名稱 Department_name

[object Object],[object Object],[object Object],[object Object],E1 E3 E2 E0 e1 e2 e3 eo d e1 eo e2 eo eo e3 eo PK FK PK PK PK FK FK 步驟八：主類別、次類別將實體和實體上的屬性畫出來，並在子類別加上超類別的主鍵 Step 8: Options for Mapping Specialization or Generalization

[object Object],[object Object],[object Object],E1 E9 E2 u a1 a2 b1 b2 e9 e9 e9 b2 b1 a1 a2 步驟九 A ：若兩實體均沒有共同屬性，則實體 E9 產生一個屬性，並在 E1 和 E2 加上成為外來鍵 FK FK e9 PK Step 9: Mapping of Union Types ( Categories )

[object Object],[object Object],[object Object],E3 E10 E4 ∩ c2 c1 u1 d2 d1 u1 ee2 c1 c2 u1 u1 d2 d1 u1 ee2 FK 步驟九 B ：若兩實體有共同屬性，則實體 E10 抓住共同屬性來當外來鍵 Step 9: Mapping of Union Types ( Categories )

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Ch4 Relational Mapping

1. CH4 Relational Mappong

2. 步驟一：將各個實體畫出，並加上屬性，並將主鍵標為 PK ( 組合屬性為 Name 、 Fname 、 Minit 、 Lname ，則 Name 不需要加上去，如上所示 ) Employee Ssn Bdate Name Fname Minit Lname Address Salary Sex Employee Eependents_of Dependents_of 1 N Name Sex Birth_date Relationship PK Supervision 1 Supervisor N Superises Sex Salary Address Bdate Ssn Lname Minit Fname

3. Employee FK PK 步驟二：將弱實體前，加上強實體的主鍵，成為外來鍵步驟三：下頁說明->為了配合圖形，先說明步驟四步驟四：若有 1:N 時，將 1 那邊實體的主鍵，加到 N 那邊成為外來鍵 ( 若是遞迴關係，則將主鍵從新命名，原因：為了避免在同一個欄位出現兩個相同的 ssn) FK PK PK ( 因此原本是 ssn ，從新命名後變成 Super_ssn) Employee Dependent 請參考前一頁投影片上的 ER 圖 Sex Salary Address Bdate Ssn Lname Minit Fname Relationship Birth_date Sex Name Employee_ssn Super_ssn Sex Salary Address Bdate Ssn Lname Minit Fname

4. Department Name Locations Number Manages 1 1 步驟三： 1 對 1 時，將任一個實體的主鍵加到另一邊上，成為外來鍵 PS ：若是如上圖所以，有一邊是完全參予的話，則將 1 條線上實體的主鍵，加到 2 條線時那邊成為外來鍵 PK FK Department 如上圖，將 employee 的主鍵放到 department 當外來鍵 Number Name Employee_ssn

6. Locations 步驟六：如下圖，將多值屬性再創一個關連表，且把自身當成外來鍵 ( 例： Locations_ 名稱 ) ，再加上原實體的主鍵形成外來鍵，兩個外來鍵合成一個主鍵 R1 E1 E2 E3 e1 e2 e3 r1 步驟七：如上圖多元關係，將關係轉變成新的關聯表，並將關係上連結的實體的主鍵放上去變成外來鍵，外來鍵加起來就是主鍵 FK FK PK Locations_ 名稱 Department_name

10. 大家加油如有錯誤，請提出指教 ~

Ch4 Relational Mapping

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Ch4 Relational Mapping