DATA MODELS<br />
Relationships  within a data model<br />  Entity<br /> Attributes<br />Data Value<br />Key Attributes<br />Record<br />
 Entity<br />Person,place,thing,event or concept about which the information is recorded<br /> Attributes<br />Attributes ...
 Key Attributes<br />The key attributes are used to find the values of other attributes<br /> Record<br />Record is the co...
Relation types<br />    ONE- TO- ONE<br />   ONE – TO- MANY<br />    MANY - TO- MANY<br />
Symbols used in E-R Diagram<br />ONE RELATION<br /> ENTITY<br />RELATION<br />MANY RELATION<br />
occupies<br />ONE-TO-ONE<br />patient<br />bed<br />assigned<br />ONE TO ONE RELATION<br />
HOSPITAL<br />ROOM<br />PATIENT<br />ONE-T0-MANY<br />ACCOMADATES<br />ONE-TO-MANY RELATION<br />
THANK YOU<br />
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Datamodels

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Datamodels

  1. 1. DATA MODELS<br />
  2. 2. Relationships within a data model<br /> Entity<br /> Attributes<br />Data Value<br />Key Attributes<br />Record<br />
  3. 3. Entity<br />Person,place,thing,event or concept about which the information is recorded<br /> Attributes<br />Attributes characterise the entity or describe the entity meaningfully.<br /> Data Value <br />Each attribute of an entity has a value and is called as data value <br />
  4. 4. Key Attributes<br />The key attributes are used to find the values of other attributes<br /> Record<br />Record is the collection of the attributes of an entity<br />
  5. 5. Relation types<br /> ONE- TO- ONE<br /> ONE – TO- MANY<br /> MANY - TO- MANY<br />
  6. 6. Symbols used in E-R Diagram<br />ONE RELATION<br /> ENTITY<br />RELATION<br />MANY RELATION<br />
  7. 7. occupies<br />ONE-TO-ONE<br />patient<br />bed<br />assigned<br />ONE TO ONE RELATION<br />
  8. 8. HOSPITAL<br />ROOM<br />PATIENT<br />ONE-T0-MANY<br />ACCOMADATES<br />ONE-TO-MANY RELATION<br />
  9. 9. THANK YOU<br />

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