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A universal relation scheme provides a view to the user of only a single relation All the component attributes will have unique names All connections are deduced from speci cation of the dependencies among attributes The complexities of a normalized model are now hidden from the user, and the underlying database relations can be freely rearranged to support optimal processing strategies Any processing that relates attributes by paths other than de ned dependencies will still require explicit de nitions, as the pure relational model does If multiple paths between the attributes are possible, either user interaction or a set of prede ned rules can be used to determine the best path The user s model can be simpli ed by exploiting the known connections, or relationships as de ned in the structural model and in the general class of entityrelationship models Now related attributes in connected relations can be found by following the connections Intermediate relations can be ignored If the implementable or actual implemented connections are restricted to a tree, we can talk about a hierarchical model These models tend to be easy to follow if they match the user s model, and the paths between attributes can be determined without ambiguity



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Listing 7-10. The OFFERINGS Table create table offerings ( course VARCHAR2(6) , begindate , trainer , location , ) ; DATE NUMBER(4) VARCHAR2(8) constraint constraint constraint constraint O_COURSE_NN O_COURSE_FK O_BEGIN_NN O_TRAIN_FK not null references courses not null references employees primary key (course,begindate)

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The parts in a subassembly (Fig 4-23) were found via the connections de ned by the hierarchy A name with hierarchical quali ers implies how the data element is accessed: machineassemblysubassemblypart

Sec 9-1

receiving funds into the account Personal Accounts are for individuals They are free and include standard bene ts for sending and receiving money, but they cannot accept credit card payments and do not have the special bene ts that Premier and Business Accounts have





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Listing 7-11. The REGISTRATIONS Table create table registrations ( attendee NUMBER(4) constraint constraint , course VARCHAR2(6) constraint , begindate DATE constraint , evaluation NUMBER(1) constraint , constraint , ) ; R_ATT_NN R_ATT_FK R_COURSE_NN R_BEGIN_NN R_EVAL_CHK R_PK not null references employees not null not null check (evaluation in (1,2,3,4,5)) primary key (attendee,course,begindate) foreign key (course,begindate) references offerings

Some problems remain for retrieval involving elements from more than two relations We will present these with the hierarchical implementations in Sec 9-4 In a network with associations and multiply referenced entity relations in the model the connections become more complex In those models the accessing style tends to require procedural descriptions Two attributes in a network may be connected by more than one path If there are multiple connections in a database model the appropriate path has to be found The user can avoid ambiguity in a network by providing the full path de nition in a query An example of two paths based on Figs 7-16 and 7-17 follows

Example 9-1

We have the owner relations Suppliers: RELATION s id : name, etc ; and two associations owned by them Supply: RELATION s id, p id : quantity ;

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Listing 7-12. The HISTORY Table create table history ( empno NUMBER(4) constraint H_EMPNO_NN not null constraint H_EMPNO_FK references employees on delete cascade constraint H_BYEAR_NN not null constraint H_BDATE_NN not null not null references departments not null primary key (empno,begindate) check (begindate < enddate)

Parts : RELATION p id : name, size, weight, etc Possible supplier : RELATION s id, p id : ;

Two possible query fragments to Locate Source of Heavy Parts are:

must agree to before you can continue Click Yes to the question, Do You Agree To The User Agreement And Privacy Policy, And Terms Incorporated Therein Click Yes to the second question, Do You Understand Your Rights With Regard To The Arbitration Of Claims As Outlined In The Legal Disputes Section Of The User Agreement

, , , ,

GET Partsweight, Supplieraddress GET Partsweight, Supplieraddress The two paths will lead to di erent result tuples

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