Database Design Using Entity-Relationship Diagrams phần 1 doc

... interesting example: EmpNo Name 10 1 Kaitlyn 10 2 Brenda 10 3 Beryl 10 4 Fred 10 5 Fred EmpNo Job Name 10 1 President Kaitlyn 10 4 Programmer Fred 10 3 Designer Beryl 10 3 Programmer Beryl Data Models ... Project# Project-location Smith 12 3 4th St 10 1 Memphis Smith 12 3 4th St 10 2 Mobile Jones 4 Moose Lane 10 1 Memphis EMPLOYEE Name Address Project# Smith 12 3 4th S...

Ngày tải lên: 13/08/2014, 12:21

... http://www.rentron.com/VisualBasic.htm (1 of 2)5/25/2004 8:47:02 PM Using Visual Basic Copyright © 19 99-2002 Reynolds Electronics | Contact Information | Reynolds Electronics 310 1 Eastridge Lane Canon City, Co. 812 12 Voice: ( 719 ) ... Electronics 310 1 Eastridge Lane Canon City, Co. 812 12 Voice: ( 719 ) 269-3469 Fax: ( 719 ) 276-2853 http://www.rentron.com/VisualBasic.htm (2 of 2)...

Ngày tải lên: 05/08/2014, 09:46

Ngày tải lên: 12/08/2014, 16:20

... 11 -12 union, rule, 12 -13 normal forms, 15 -18 examples of 1NF, 2NF, and 3NF, 17 -19 first normal form, 15 second normal form, 15 -16 third normal form, 16 Specialization, 26 , 19 1, 19 4, ... for specifying, 15 4 recursive relationships and, 14 7 ternary relationships, 16 9 weak entities and, 11 9 Subclass, 18 8 , 18 9, 19 0, 19 1, 19 3, 19 5,...

Ngày tải lên: 13/08/2014, 12:21

... interesting example: EmpNo Name 10 1 Kaitlyn 10 2 Brenda 10 3 Beryl 10 4 Fred 10 5 Fred EmpNo Job Name 10 1 President Kaitlyn 10 4 Programmer Fred 10 3 Designer Beryl 10 3 Programmer Beryl type of ... Project# Project-location Smith 12 3 4th St 10 1 Memphis Smith 12 3 4th St 10 2 Mobile Jones 4 Moose Lane 10 1 Memphis EMPLOYEE Name Address Project# Smith 12 3 4th St 1...

Ngày tải lên: 27/06/2014, 08:20

... address major Jones 932– 510 0 U. Alabama 12 3 4th St Chemistry Smith 932– 510 1 U. Mississippi 12 3 5th St Math Adams 932– 510 2 LSU 12 3 6th St Agriculture Sumon 435–0997 UWF 11 000 Univ Comp Sc Mala ... Approach," Entity-Relationship Approach to System Analysis and Design , P. Chen, Ed., Elsevier, North-Holland, Amsterdam, 12 1 14 0, 19 80. Teorey, T.J., Yang, D., an...

Ngày tải lên: 13/08/2014, 12:21

... Entity (using mapping rule M1 and M1a) Relation for the OWNER Entity (using mapping rule M1 and M1a) STORE–dept snum depts 1 Tall men's clothing 1 Women's clothing 1 Children's ... "numerically involved" in a relationship: one-to-one (1: 1), many-to-one (M :1) , one-to-many (1: M), and many-to-many (M:N). One-to-One (1: 1) In this type of relationshi...

Ngày tải lên: 13/08/2014, 12:21

... Relationship (1: M) Relationships that are 1: M or M :1 are really relative views of the same problem. When specifying 1: M or M :1, we need to be especially careful to specify which entity is 1 (one) ... relationship is A:B: :1: M, then there is a relationship from A (1) to B(M) and from B(M) back to A (1) . Pattern 1 — M :1, from the M side, full participation x, which are re...

Ngày tải lên: 13/08/2014, 12:21

... ename essn dnum snum Kaitlyn 987–754–9865 5 01 1 Fred 276–263– 918 27 502 1 Katie 982–928–2726 503 1 Seema 837–937–9373 5 01 1 Raju 988–876–3434 6 01 2 . . . name store_name name address ... For Example, if a relationship is A:B: :1: M, then there is a relationship from A (1) to B(M) and from B(M) back to A (1) . Refer to Figure 4 .11 . Figure 4 .11 : An ER Dia...

Ngày tải lên: 13/08/2014, 12:21

... 6 .17 . EMPLOYEE ename essn dnum snum dm_ssn Kaitlyn 987–754–9865 5 01 1 276–263– 918 2 Fred 276–263– 918 2 502 1 null Katie 982–928–2726 503 1 987–754–9865 Seema 837–937–9373 5 01 1 276–263– 918 2 ... Management , Auerbach Publications, Boca Raton, FL, 22 -10 -43, 1 17 , April 2000. Hawryszkiewycz, I., Database Analysis and Design , SRA, Chicago, 19 84. Mark, L., "...

Ngày tải lên: 13/08/2014, 12:21