Lecture 9: The E/R Model II. 2. E/R Design Considerations 2/7/2018. Multiplicity of E/R Relationships. What you will learn about in this section
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1 Leture 9: The E/R Moel II Leture n tivity ontents re se on wht Prof Chris Ré use in his CS 45 in the fll 06 term with permission.. E/R Design Consiertions Wht you will lern out in this setion Multipliity of E/R Reltionships. Reltionships ont : multipliity, multi wy. Design onsiertions. Conversion to SQL 4. ACTIVITY: Cryon Time! Drwing E/R igrms Pt. II One to one: Mny to one: One to mny: Mny to mny: Inite using rrows X > Y mens there exists funtion mpping from X to Y (rell the efinition of funtion) 4 nme tegory nme Multi wy Reltionships prie Prout uys mkes Wht oes this sy? Compny stokprie employs How o we moel purhse reltionship etween uyers, prouts n stores? Prout Purhse ress nme ssn 5 NB: Cn still moel s mthemtil set (how?) 6
2 Arrows in Multiwy Reltionships Arrows in Multiwy Reltionships Q: Wht oes the rrow men? Prout Q: Wht oes the rrow men? Prout Purhse Purhse 7 8 Arrows in Multiwy Reltionships Converting Multi wy Reltionships to Binry Q: How o we sy tht every person shops in t most one store? Prout Purhse te Purhse ProutOf Of Prout From wht we h on previous slie to this wht i we o? A: Cnnot. This is the est pproximtion. (Why only pproximtion?) 9 0 Converting Multi wy Reltionships to New Entity + Binry Reltionships Deision: Multi wy or New Entity + Binry? Sie note: Wht rrows shoul e e here? Are these orret? te Purhse ProutOf Of Prout Prout Multi wy Reltionship Purhse Entity + Binry ProutOf te Purhse Of Prout Shoul we use single multi wy reltionship or new entity with inry reltions?
3 Deision: Multi wy or New Entity + Binry? Deision: Multi wy or New Entity + Binry? (A) Multi wy Reltionship (B) Entity + Binry (A) Multi wy Reltionship (B) Entity + Binry Prout te ProutOf Prout Prout te ProutOf Prout Purhse Purhse Of Purhse Purhse Of Multiple purhses per (prout, store, person) omo possile here! Covere erlier: (B) is useful if we wnt to hve multiple instnes of the reltionship per entity omintion We n more finegrine onstrints here! (B) is lso useful when we wnt to etils (onstrints or ttriutes) to the reltionship A person who shops in only one store How long person hs een shopping t store 4 Deision: Multi wy or New Entity + Binry? (A) Multi wy Reltionship (B) Entity + Binry ProutOf Prout Prout te. Design Priniples Wht s wrong with these exmples? Purhse Purhse Of Prout Purhse (A) is useful when reltionship relly is etween multiple entities Ex: A three prty legl ontrt Country Presient 5 6 Design Priniples: Wht s Wrong? Design Priniples: Wht s Wrong? te Dtes te Prout Prout Purhse Purhse personar personnme 7 8
4 Exmples: Entity vs. Attriute Exmples: Entity vs. Attriute Shoul ress (A) e n ttriute? Or (B) e n entity? Shoul ress (A) e n ttriute? How o we hnle employees with multiple resses here? Ar Ar Street Ar Aress ArOf ZIP Ar Ar How o we hnle resses where internl struture of the ress (e.g. zip oe, stte) is useful? 9 0 Exmples: Entity vs. Attriute Shoul ress (A) e n ttriute? Ar Ar Or (B) e n entity? Street Ar Aress ZIP From E/R Digrms to Reltionl Shem Key onept: Both Entity sets n Reltionships eome reltions (tles in RDBMS) ArOf In generl, when we wnt to reor severl vlues, we hoose new entity From E/R Digrms to Reltionl Shem From E/R Digrms to Reltionl Shem An entity set eomes reltion (multiset of tuples / tle) Eh tuple is one entity Eh tuple is ompose of the entity s ttriutes, n hs the sme primry key prie tegory nme Prout Prout nme prie tegory Gizmo Cmer Gizmo 9.99 Eile CREATE TABLE Prout( nme CHAR(50) PRIMARY KEY, prie DOUBLE, tegory VARCHAR(0) ) prie tegory nme Prout Prout nme prie tegory Gizmo Cmer Gizmo 9.99 Eile 4 4
5 From E/R Digrms to Reltionl Shem From E/R Digrms to Reltionl Shem A reltion etween entity sets A,, A N lso eomes multiset of tuples / tle Eh row/tuple is one reltion, i.e. one unique omintion of entities (,, N ) Eh row/tuple is ompose of the union of the entity sets keys hs the entities primry keys s foreign keys hs the union of the entity sets keys s primry key prie te firstnme lstnme nme tegory Prout Purhse Purhse firstnme lstnme nme te Gizmo Bo Joe 0/0/5 Gizmo Joe Bo 0/0/5 Gizmo JoeBo Smith 0/05/5 CREATE TABLE Purhse( nme CHAR(50), firstnme CHAR(50), lstnme CHAR(50), te DATE, PRIMARY KEY (nme, firstnme, lstnme), FOREIGN KEY (nme) REFERENCES Prout, FOREIGN KEY (firstnme, lstnme) REFERENCES ) te firstnme lstnme nme tegory prie Prout Purhse Purhse firstnme lstnme nme te Gizmo Bo Joe 0/0/5 Gizmo Joe Bo 0/0/5 Gizmo JoeBo Smith 0/05/5 5 6 From E/R Digrm to Reltionl Shem How o we represent this s reltionl shem? prie nme Prout tegory te Purhse firstnme lstnme ACTIVITY: E/R Digrms Prt II nme ress 7 8 A rrows to your E/R igrm! Also mke sure to (new onepts unerline): A plyer n only elong to one tem, ply n only e in one gme, pss/run..? Plyers n hieve l Reor linke to speifi Gme n Ply Plyers hve weight whih hnges in on vs. off seson 9 5
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