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สอน Entity ความสัมพันธ์
1.
โครงสร้างข้อบังคับ Structural Constraints
2.
ชนิดของความสัมพันธ์ Cardinality Constraint
Participation Constraint
3.
Cardinality Constraint แบ่งออกเป็ น
3 ประเภท 1. one-to-one (1:1) 2. one-to-many (1:M) 3. many-to-many (M:M)
4.
Cardinality Constraint one-to-one Relationship
(1:1) สัญลักษณ์ 1 1
5.
Cardinality Constraint (1:1) •
one-to-one Relationship (1:1) Semantic net Model พนักงาน (empNo) การจัดการ Relationship types สาขา (BranchNo) SG05 SG37 SL21 R1 R2 B003 B005
6.
Cardinality Constraint (1:1) one-to-one
Relationship (1:1) ความสัมพันธ์แบบ Zero or one พนักงาน สาขาการจัดการ
7.
Cardinality Constraint one-to-many Relationship
(1:M) สัญลักษณ์ 1 M
8.
Cardinality Constraint • one-to-many
Relationship (1:M) Semantic net Model SG05 SG37 SL21 R1 R3 PG21 PG14 พนักงาน (empNo) การดูแล relationships type อสังการิมทรัพย์ที่ให้เ่่า (propertyNo) R2 PG35 PG04
9.
Cardinality Constraint • one-to-Many
Relationship (1:M) พนักงานดูแลบ้านเช่าหลายหลังหรือไม่ดูแลก็ได้ (Zero or more) บ้านเช่าแต่ละหลังจะถูกดูแลโดยพนักงาน 1 คนหรือไม่มีก็ได้ พนักงาน บ้านเช่าManages
10.
Cardinality Constraint • many-to-many
Relationship (M:M) สัญลักษณ์ M M
11.
Cardinality Constraint (M:M) •
many-to-many Relationship (M:M) Semantic net Model
12.
Cardinality Constraint • Semantic
net Model หนังสือพิมพ์ (newspaperName) การโฆษณา ่นิดของความสัมพันธ์ อสังหาริมทรัพย์ที่ให้เ่่า (propertyNo) The nation Daily News Bangkok Post R1 R2 R3 R4 PG21 PG36 PA14 PA04
13.
Cardinality Constraint • Many-to-Many
Relationship (M:M) หนังสือพิมพ์แต่ละฉบับโฆษณาบ้านเช่าได้มากกว่า 1 หลัง บ้านแต่ละหลังโฆษณาหรือไม่ลงเลยก็ได้ หนังสือพิมพ์ บ้านเช่าโฆษณา
14.
Participation Constraint • แบ่งได้เป็
น 2 ประเภท 1. Total participation หรือ Mandatory 2. Partial participation หรือ Optional
15.
Participation Constraint (Total) •
1. Total participation หรือ Mandatory – ความสัมพันธ์แบบชนิดบังคับ สาขา พนักงานมี branchNo empNo 1 M
16.
Participation Constraint (Partial) •
2. Partial participation หรือ optional –ความสัมพันธ์แบบชนิดเลือกได้ สาขา พนักงานมี branchNo empNo 1 M
17.
อ้างอิง โอภาส เอี่ยมสิริวงศ์ ระบบฐานข้อมูล. –กรุงเทพฯ
: ซีเอ็ดยูเคชัน, 2551. 432 หน้า. 1.การออกแบบฐาข้อมูล. 2.การจัดการฐานข้อมูล I.ชื่อเรื่อง
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