here
... Each student is enrolled in at most one course No two students in a course get the same grade ...
... Each student is enrolled in at most one course No two students in a course get the same grade ...
Supporting Object Models with Relational Databases
... Next, you can see how the UML supertypes and subtypes have been transformed into an IDEF1X Logical model. The UML generalization and the IDEF1X Logical model are similar when it comes to representing this kind of structure. Lastly, Figure 5-21 shows the UML and IDEF1X Logical model represented in a ...
... Next, you can see how the UML supertypes and subtypes have been transformed into an IDEF1X Logical model. The UML generalization and the IDEF1X Logical model are similar when it comes to representing this kind of structure. Lastly, Figure 5-21 shows the UML and IDEF1X Logical model represented in a ...
distributed databases and client-server
... of columns. Thus a vertical fragment of a relation will contain values of selected columns. There is no selection condition used in vertical fragmentation. Consider the Employee relation. A vertical fragment can be created by keeping the values of Name, Bdate, Sex, and Address. Because there is no c ...
... of columns. Thus a vertical fragment of a relation will contain values of selected columns. There is no selection condition used in vertical fragmentation. Consider the Employee relation. A vertical fragment can be created by keeping the values of Name, Bdate, Sex, and Address. Because there is no c ...
CS331: Database Programming: Architectures and Issues
... boolean previous(). Tuple access functionality, as described on the next slide. Update functionality, for results from simple queries, through deleteRow(), updateXXX(). Control functionality, through setFetchSize(int rows). ...
... boolean previous(). Tuple access functionality, as described on the next slide. Update functionality, for results from simple queries, through deleteRow(), updateXXX(). Control functionality, through setFetchSize(int rows). ...
Outerjoins, Schema Creation, and Views
... • Right outer join: – Include the right tuple even if there’s no match ...
... • Right outer join: – Include the right tuple even if there’s no match ...
GIS and Remote Sensing in Water Resources Management
... set of last name, first name and address. non redundancy ; any key attribute selected and tabulated should keep the key's uniqueness. e.g. address can not be dropped from telephone address, because there may be many with the same names. Prime attribute : an attribute listed in at least one key. The ...
... set of last name, first name and address. non redundancy ; any key attribute selected and tabulated should keep the key's uniqueness. e.g. address can not be dropped from telephone address, because there may be many with the same names. Prime attribute : an attribute listed in at least one key. The ...
Seamlessness as a desirable aspect of quality for MDE: the
... added to distinguish between the different classes in the hierarchy. A Rational Software whitepaper [19] describes a set of rules for mapping from classes to relational tables. In mapping an inheritance hierarchy they state that "The corresponding data model specifies 2 tables and an identifying rel ...
... added to distinguish between the different classes in the hierarchy. A Rational Software whitepaper [19] describes a set of rules for mapping from classes to relational tables. In mapping an inheritance hierarchy they state that "The corresponding data model specifies 2 tables and an identifying rel ...
Structured Query Language (SQL) - Triple Dash Infotech Pvt. Ltd.
... tables. Views derive their data from the tables on which they are based, which are known as base tables. All operations performed on a view actually affect the base tables of the view. You can use views for several purposes: To give you an additional level of table security by restricting access to ...
... tables. Views derive their data from the tables on which they are based, which are known as base tables. All operations performed on a view actually affect the base tables of the view. You can use views for several purposes: To give you an additional level of table security by restricting access to ...
Mapping XML to a Wide Sparse Table
... access for another column. For example, considera selection on one column, e.g., A=6 null(T ), a frequentoperation in translated algebra expressions. If there is no indexon column A, the selection requires a full table scan. If thetable has an index on column B and the DG indicates thatevery row wit ...
... access for another column. For example, considera selection on one column, e.g., A=6 null(T ), a frequentoperation in translated algebra expressions. If there is no indexon column A, the selection requires a full table scan. If thetable has an index on column B and the DG indicates thatevery row wit ...
DATASPREAD: Unifying Databases and Spreadsheets
... to manage data in form of tables, their treatment of this data is vastly different. Spreadsheets have been developed primarily with presentation of data in mind and hence their design focuses primarily on simplicity, intuitiveness and a rich user interface. On the other hand databases have been desi ...
... to manage data in form of tables, their treatment of this data is vastly different. Spreadsheets have been developed primarily with presentation of data in mind and hence their design focuses primarily on simplicity, intuitiveness and a rich user interface. On the other hand databases have been desi ...
DATASPREAD: Unifying Databases and Spreadsheets
... to manage data in form of tables, their treatment of this data is vastly different. Spreadsheets have been developed primarily with presentation of data in mind and hence their design focuses primarily on simplicity, intuitiveness and a rich user interface. On the other hand databases have been desi ...
... to manage data in form of tables, their treatment of this data is vastly different. Spreadsheets have been developed primarily with presentation of data in mind and hence their design focuses primarily on simplicity, intuitiveness and a rich user interface. On the other hand databases have been desi ...
Extended Learning Module C
... Identify the steps necessary to implement the structure of a relational database using the data definition language provided by Microsoft Access. Demonstrate how to use the data manipulation subsystem in Access to enter and change information in a database and how to query that ...
... Identify the steps necessary to implement the structure of a relational database using the data definition language provided by Microsoft Access. Demonstrate how to use the data manipulation subsystem in Access to enter and change information in a database and how to query that ...
Database - oppi.uef.fi
... Foreign Keys A relation schema may have an attribute that corresponds to the primary ...
... Foreign Keys A relation schema may have an attribute that corresponds to the primary ...
2006_Spring_CS306_Lecture_2A
... that is being described in the database relations. We can check a database instance to see if an IC is violated, but we can NEVER infer that an IC is true by looking at an instance. ...
... that is being described in the database relations. We can check a database instance to see if an IC is violated, but we can NEVER infer that an IC is true by looking at an instance. ...
Document
... – Primary key on the one side becomes a foreign key on the many side • Many-to-Many (M:N) – Create a new relation with the primary keys of the two entities as its primary key • One-to-One (1:1) – Primary key on the mandatory side becomes a foreign key on the optional side ...
... – Primary key on the one side becomes a foreign key on the many side • Many-to-Many (M:N) – Create a new relation with the primary keys of the two entities as its primary key • One-to-One (1:1) – Primary key on the mandatory side becomes a foreign key on the optional side ...
Query languages for the web
... is a query language important? What can a query language do for the web? How can it be achieved ? ...
... is a query language important? What can a query language do for the web? How can it be achieved ? ...