database-computer.blogspot.com
Database: RELATIONAL DATABASE
http://database-computer.blogspot.com/2010/01/relational-database.html
Wednesday, January 27, 2010. Matches data by using common characteristics found within the data set. The resulting groups of data are organized and are much easier for people to understand. For example, a data set containing all the real-estate transactions in a town can be grouped by the year the transaction occurred; or it can be grouped by the sale price of the transaction; or it can be grouped by the buyer's last name; and so on. Such a grouping uses the relational model. The term relational database.
database-computer.blogspot.com
Database: TRIGGER
http://database-computer.blogspot.com/2010/01/trigger.html
Wednesday, January 27, 2010. Is procedural code that is automatically executed in response to certain events on a particular. The trigger is mostly used for keeping the integrity of the information on the database. For example, when a new record (representing a new worker) added to the employees table, new records should be created also in the tables of the taxes, vacations, and salaries. There are typically three triggering events that cause data triggers to 'fire':. Event (as a record is being changed).
database-computer.blogspot.com
Database: TABLE
http://database-computer.blogspot.com/2010/01/table.html
Wednesday, January 27, 2010. In relational database and flat files database. Is a set of data elements (values) that is organized using a model of vertical columns. Which are identified by their name) and horizontal rows. A table has a specified number of columns, but can have any number of rows. Each row is identified by the values appearing in a particular column subset which has been identified as a candidate key. Table is another term for relations. Posted by Mariany Susanti.
database-computer.blogspot.com
Database: VIEW
http://database-computer.blogspot.com/2010/01/view.html
Wednesday, January 27, 2010. In database theory, a view. Consists of a stored query. Accessible as a virtual table. Composed of the result set of a query. Unlike ordinary tables (base tables) in a relational database. A view does not form part of the physical schema. It is a dynamic, virtual table computed or collated from data. Shown in subsequent invocations of the view. Views can provide advantages over tables:. Views can represent a subset of the data contained in a table. The actual underlying table.
database-computer.blogspot.com
Database
http://database-computer.blogspot.com/2010/01/mysql-mysql-is-rdbms-that-has-more-than.html
Thursday, January 14, 2010. That has more than 11 million installations. MySQL is named after Monty Widenius. S daughter My. The program runs as a server providing multi-user access to a number of databases. MySQL is officially pronounced. My S-Q-L), but often pronounced. Now a subsidiary of sun microsystem. Oracle Corpoation began the process of acquiring Sun Microsystems. MySQL is often used in free software. And other software built on the LAMP. From http:/ en.wikipedia.org/wiki/MySQL. MYSQL MySQL is ...
database-computer.blogspot.com
Database: November 2009
http://database-computer.blogspot.com/2009_11_01_archive.html
Tuesday, November 24, 2009. Management system (DBMS) such as Access. Provides you with the software tools you need to organize that data in a flexible manner. It includes facilities to add, modify or delete data from the database, ask questions (or queries) about the data stored in the database and produce reports summarizing selected contents. Oracle is a powerful relational database. Microsoft SQL Server 2000. Microsoft SQL Server 2000 is a full-featured relational database. Posted by Mariany Susanti.
database-computer.blogspot.com
Database: CHECK CONSTRAINT
http://database-computer.blogspot.com/2010/01/check-constraint.html
Wednesday, January 27, 2010. Also known as table check constraint. Is a condition that defines valid data when adding or updating an entry in a table of a relational database. For example, in a table. Containing products, one could add a check constraint such that the price of a product and quantity of a product is a non-negative value:. If these constraints were not in place, it would be possible to have a negative price (-$30) or quantity (-3 items). Each check constraint has to be defined in the.
database-computer.blogspot.com
Database: FOREIGN KEY
http://database-computer.blogspot.com/2010/01/foreign-key.html
Wednesday, January 27, 2010. A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables. You can create a foreign key by defining a FOREIGN KEY constraint when you create or modify a table. In a foreign key reference, a link is created between two tables when the column or columns that hold the primary key value for one table. Are referenced by the column or columns in another table. For example, the Sales.SalesOrderHeader. Subscri...
database-computer.blogspot.com
Database: QUERY
http://database-computer.blogspot.com/2010/01/query.html
Wednesday, January 27, 2010. Are computer language used to make queries into databases. Broadly, query languages can be classified according to whether they are database. Query languages or information retrieval query language Examples include:. Is a proprietary object-oriented query language for querying relational databases. CQL) a formal language for representing queries to information retrieval. Systems such as web indexes or bibliographic catalogues. COQL) is used in the concept-oriented model.
database-computer.blogspot.com
Database: PRIMARY KEY
http://database-computer.blogspot.com/2010/01/primary-key.html
Wednesday, January 27, 2010. Usually has a column or combination of columns whose values uniquely identify each row in the table. This column (or columns) is called the primary key. Of the table and enforces the entity integrity. Of the table. You can create a primary key by defining a PRIMARY KEY constraint. When you create or alter a table. As shown in the following illustration, the au id. Columns in the titleauthor. Table form a composite PRIMARY KEY constraint for the titleauthor. Table, the titles.
