Database System ConceptsIntended for a first course in databases at junior or senior undergraduate, or first year graduate level, this work provides extensive coverage of concepts, database system internals and tools and techniques. |
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Page 316
... object must have a most - specific class , that is , if the object belongs to many classes , it must belong to one class that is a ( direct or indirect ) subclass of all the other classes to which the object belongs . For example , if an ...
... object must have a most - specific class , that is , if the object belongs to many classes , it must belong to one class that is a ( direct or indirect ) subclass of all the other classes to which the object belongs . For example , if an ...
Page 331
... object immediately , or fetch referenced objects in a lazy fashion . In lazy fetching of objects , the root object is initially " hollow " , that is , it is assigned a memory location but its fields are not initialized . When a hollow ...
... object immediately , or fetch referenced objects in a lazy fashion . In lazy fetching of objects , the root object is initially " hollow " , that is , it is assigned a memory location but its fields are not initialized . When a hollow ...
Page 429
... objects that are not easily decomposed into smaller components . Such large objects may each be stored in a separate file . We discuss this idea further in Section 11.9.6 . 11.9.2 Implementation of Object Identifiers Since objects are ...
... objects that are not easily decomposed into smaller components . Such large objects may each be stored in a separate file . We discuss this idea further in Section 11.9.6 . 11.9.2 Implementation of Object Identifiers Since objects are ...
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account number account-number aggregate algorithm amount application assets B+-tree balance bank BCNF block borrower branch-city branch-name Brooklyn bucket candidate key Chapter clause compute consider contains customer-city customer-name customer-street data model database design database system Datalog decomposition defined definition delete depositor disk domain domain relational calculus Downtown E-R diagram E-R model employee example expression Figure foreign key functional dependencies hash identifier implementation insert interface JDBC Jones loan number loan-number manager multivalued dependencies node normal form null values object object-oriented ODBC ODMG operation outer join Perryridge branch persistent pointers primary key programming language query Find query language r₁ records recursive relation schema relational algebra relational calculus relational database relational-algebra relationship set result search-key value Section select customer-name specify storage stored structure subquery superkey t₁ trigger tuple relational calculus tuples update variable view relation weak entity weak entity set write