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ment It is often useful to identify a collection of similar entities Such a collection is called an entity set Note that entity sets need not be disjoint; the collection of toy department employees and the collection of appliance department employees may both contain employee John Doe (who happens to work in both departments) We could also de ne an entity set called Employees that contains both the toy and appliance department employee sets An entity is described using a set of attributes All entities in a given entity set have the same attributes; this is essentially what we mean by similar (This statement is an oversimpli cation, as we will see when we discuss inheritance hierarchies in Section 244, but it su ces for now and highlights the main idea) Our choice of attributes re ects the level of detail at which we wish to represent information about entities For example, the Employees entity set could use name, social security number (ssn), and parking lot (lot) as attributes In this case we will store the name, social security number, and lot number for each employee However, we will not store, say, an employee s address (or gender or age) For each attribute associated with an entity set, we must identify a domain of possible values For example, the domain associated with the attribute name of Employees might be the set of 20-character strings2 As another example, if the company rates employees on a scale of 1 to 10 and stores ratings in a eld called rating, the associated domain consists of integers 1 through 10 Further, for each entity set, we choose a key A key is a minimal set of attributes whose values uniquely identify an entity in the set There could be more than one candidate key; if so, we designate one of them as the primary key For now we will assume that each entity set contains at least one set of attributes that uniquely identi es an entity in the entity set; that is, the set of attributes contains a key We will revisit this point in Section 243 The Employees entity set with attributes ssn, name, and lot is shown in Figure 21 An entity set is represented by a rectangle, and an attribute is represented by an oval Each attribute in the primary key is underlined The domain information could be listed along with the attribute name, but we omit this to keep the gures compact The key is ssn.

Figure 9-8 shows the relationships of the four les comprising the single hierarchy Each relation, entity or nest, is implemented with a separate le The level 01 entries in the SCHEMA for each le provide space for the owner ruling part in the nest relations All cross references between the les are maintained by the system, so that the user is not aware of any structure outside of the declared schema All attributes are indexed unless NON-KEY appears in the schema de nitions If a retrieval request involves an attribute which is not indexed, or requires an exhaustive scan of the database because of the form of the selection clause, ie GET employee WHERE weight > 150 then long processing times can be encountered One currency indicator for each level is maintained by SYSTEM 2000, as indicated in Fig 9-8 The collection of current segments de nes a record, which may be incomplete A GET1 command with a key establishes a new currency indicator position for the matched segment, and also sets ancestor currency indicators, while descendant currency indicators are reset to NULL GET1 NEXT commands which refer to a NULL level move the currency indicator to the rst record while again resetting yet descendant currency indicators to NULL From the rst record onward

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the compiler will decide that both a and b should be of type int. But if you were thinking they should be of type double, and later try something like this:

GET1 NEXT will obtain the other records sequentially in the nest le, moving from nest to nest Currency is rede ned as the retrieval proceeds GETA and GETD commands obtain ancestors and descendants If one nest at a time is to be obtained, it is necessary to recognize when the current owner is about to change SYSTEM 2000 provides the combination LOCATE and GET NEXT for this purpose An END OF DATA message is generated as a result when the NEXT entry is outside of the broom of the current ancestor The ancestor is not restricted to the immediate owner To obtain, for instance, the schools attended by the children of Hare, the sequence could be

a = 7.4; b = 5.5;

Example 9-17

The designer of Note has opted to make the Read(...) method virtual but not to make the Write(...) method virtual:

LOCATE education WHERE name = "Hare" GET NEXT education -> "St Mary" GET NEXT education -> "St Mary" GET NEXT education -> "UC Berkeley" GET NEXT education -> END OF DATA In addition the program will contain OPEN, GET, INSERT, MODIFY, REMOVE, and CLOSE statements of various avors which will allow accessing the various les comprising the tree A WHERE clause adds selection capability, and ORDER BY provides sequencing A HAS clause allows speci cation of the descendants of a segment, so that a predicate can be restricted to that part of a broom Aggregation operations available in the self-contained language are SUM, COUNT, MINIMUM, MAXIMUM, AVERAGE, and the equally important SIGMA to obtain the standard deviation

public virtual void Read( ) public void Write( )

A relationship is an association among two or more entities For example, we may have the relationship that Attishoo works in the pharmacy department As with entities, we may wish to collect a set of similar relationships into a relationship set

In a real-world application, you would almost certainly mark both methods as virtual, but we ve differentiated them to demonstrate that the developer is free to pick and choose which methods are made virtual.

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