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The Relational Data Model Tables Schemas Conversion from E/R to Relations
A Relation is a Table ,[object Object],[object Object],[object Object],[object Object],Attributes (column headers) Tuples (rows)
Schemas ,[object Object],[object Object],[object Object],[object Object]
Why Relations? ,[object Object],[object Object],[object Object],[object Object]
From E/R Diagrams to Relations ,[object Object],[object Object],[object Object],[object Object]
Entity Set -> Relation ,[object Object],Beers name manf
Relationship -> Relation Drinkers Beers name addr name manf Likes Likes(drinker, beer) Favorite Favorite(drinker, beer) Married husband wife Married(husband, wife) Buddies 1 2 Buddies(name1, name2)
Combining Relations ,[object Object],[object Object]
Risk with Many-Many Relationships ,[object Object],name addr beer Sally 123 Maple Bud Sally 123 Maple Miller Redundancy
Handling Weak Entity Sets ,[object Object],[object Object]
Example Logins Hosts At name name Hosts(hostName) Logins(loginName, hostName, time) At(loginName, hostName, hostName2) time Must be the same At becomes part of Logins
Entity Sets With Subclasses ,[object Object],[object Object],[object Object],[object Object]
Example Beers Ales isa name manf color
E/R Style name manf Bud Anheuser-Busch Summerbrew Pete’s Beers name color Summerbrew dark Ales
Using Nulls name manf color Bud Anheuser-Busch NULL Summerbrew Pete’s dark Beers

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rrrrrr

  • 1. The Relational Data Model Tables Schemas Conversion from E/R to Relations
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7. Relationship -> Relation Drinkers Beers name addr name manf Likes Likes(drinker, beer) Favorite Favorite(drinker, beer) Married husband wife Married(husband, wife) Buddies 1 2 Buddies(name1, name2)
  • 8.
  • 9.
  • 10.
  • 11. Example Logins Hosts At name name Hosts(hostName) Logins(loginName, hostName, time) At(loginName, hostName, hostName2) time Must be the same At becomes part of Logins
  • 12.
  • 13. Example Beers Ales isa name manf color
  • 14. E/R Style name manf Bud Anheuser-Busch Summerbrew Pete’s Beers name color Summerbrew dark Ales
  • 15. Using Nulls name manf color Bud Anheuser-Busch NULL Summerbrew Pete’s dark Beers