Hierarchical:
Refers to systems that are organized in the shape of a pyramid, with each row of objects linked to objects directly beneath it. Hierarchical systems pervade everyday life.
Hierarchical systems are as popular in computer systems as they are in other walks of life. The most obvious example of a hierarchical system in computers is a file system, in which directories have files and subdirectories beneath them. Such a file organization is, in fact, called a hierarchical file system . In addition to file systems, many data structures for storing information are hierarchical in form. Menu-driven programs are also hierarchical, because they contain a root menu at the top of the pyramid and submenus below it.
Relationship:
Its central idea is to describe a database as a collection of predicates over a finite set of predicate variables, describing constraints on the possible values and combinations of values. The content of the database at any given time is a finite (logical) model of the database, i.e. a set of relations, one per predicate variable, such that all predicates are satisfied. A request for information from the database (a database query) is also a predicate.
Sunday, November 22, 2009
Monday, August 17, 2009
My_Idea_Is
PART II.
A. Discuss what you have learned and understood about what DBMS is,so far.
I have learned that DBMS is responsible in building up or managing database.It is a collection of interrelated data together with a set of programs to access the data, also called database system, or simply database.The primary goal of such a system is to provide an environment that is both convenient and efficient to use in retrieving and storing information.A database management system (DBMS) is designed to manage a large body of information. Data management involves both defining structures for storing information and providing mechanisms for manipulating the information.In addition, the database system must provide for the safety of the stored information, despite system crashes or attempts at unauthorized access.
B.Define how each of the ff. fit and function within the framework or relational DBMS system.
*Data field- all area in a computer memory or program or screen.It is a place where you can store data. Commonly used to refer to a column in a database or a field in a data entry form or web form.The field may contain data to be entered as well as data to be displayed.
*Forms- a kind of specifications of which data types are you gonna use.
*Foreign key- the uniformity and simultaneous access for your datas.is a referential constraint between two tables. The foreign key identifies a column or a set of columns in one (referencing) table that refers to a column or set of columns in another (referenced) table. The columns in the referencing table must be the primary key or other candidate key in the referenced table. The values in one row of the referencing columns must occur in a single row in the referenced table.
*Queries- Allow us to view data in different ways.is a form of questioning, in a line of inquiry.
*Records- The answered queries that you had put on or stored.
*Reports- Allow us to format a data.It is a document characterized by information or other content reflective of inquiry or investigation, which is tailored to the context of a given situation and audience.
A. Discuss what you have learned and understood about what DBMS is,so far.
I have learned that DBMS is responsible in building up or managing database.It is a collection of interrelated data together with a set of programs to access the data, also called database system, or simply database.The primary goal of such a system is to provide an environment that is both convenient and efficient to use in retrieving and storing information.A database management system (DBMS) is designed to manage a large body of information. Data management involves both defining structures for storing information and providing mechanisms for manipulating the information.In addition, the database system must provide for the safety of the stored information, despite system crashes or attempts at unauthorized access.
B.Define how each of the ff. fit and function within the framework or relational DBMS system.
*Data field- all area in a computer memory or program or screen.It is a place where you can store data. Commonly used to refer to a column in a database or a field in a data entry form or web form.The field may contain data to be entered as well as data to be displayed.
*Forms- a kind of specifications of which data types are you gonna use.
*Foreign key- the uniformity and simultaneous access for your datas.is a referential constraint between two tables. The foreign key identifies a column or a set of columns in one (referencing) table that refers to a column or set of columns in another (referenced) table. The columns in the referencing table must be the primary key or other candidate key in the referenced table. The values in one row of the referencing columns must occur in a single row in the referenced table.
*Queries- Allow us to view data in different ways.is a form of questioning, in a line of inquiry.
*Records- The answered queries that you had put on or stored.
*Reports- Allow us to format a data.It is a document characterized by information or other content reflective of inquiry or investigation, which is tailored to the context of a given situation and audience.
My_Idea_Is
PART II.
A. Discuss what you have learned and understood about what DBMS is,so far.
I have learned that DBMS is responsible in building up or managing database.It is a collection of interrelated data together with a set of programs to access the data, also called database system, or simply database.The primary goal of such a system is to provide an environment that is both convenient and efficient to use in retrieving and storing information.A database management system (DBMS) is designed to manage a large body of information. Data management involves both defining structures for storing information and providing mechanisms for manipulating the information.In addition, the database system must provide for the safety of the stored information, despite system crashes or attempts at unauthorized access.
B.Define how each of the ff. fit and function within the framework or relational DBMS system.
*Data field- all area in a computer memory or program or screen.It is a place where you can store data. Commonly used to refer to a column in a database or a field in a data entry form or web form.The field may contain data to be entered as well as data to be displayed.
*Forms- a kind of specifications of which data types are you gonna use.
*Foreign key- the uniformity and simultaneous access for your datas.is a referential constraint between two tables. The foreign key identifies a column or a set of columns in one (referencing) table that refers to a column or set of columns in another (referenced) table. The columns in the referencing table must be the primary key or other candidate key in the referenced table. The values in one row of the referencing columns must occur in a single row in the referenced table.
*Queries- Allow us to view data in different ways.is a form of questioning, in a line of inquiry.
*Records- The answered queries that you had put on or stored.
*Reports- Allow us to format a data.It is a document characterized by information or other content reflective of inquiry or investigation, which is tailored to the context of a given situation and audience.
A. Discuss what you have learned and understood about what DBMS is,so far.
I have learned that DBMS is responsible in building up or managing database.It is a collection of interrelated data together with a set of programs to access the data, also called database system, or simply database.The primary goal of such a system is to provide an environment that is both convenient and efficient to use in retrieving and storing information.A database management system (DBMS) is designed to manage a large body of information. Data management involves both defining structures for storing information and providing mechanisms for manipulating the information.In addition, the database system must provide for the safety of the stored information, despite system crashes or attempts at unauthorized access.
B.Define how each of the ff. fit and function within the framework or relational DBMS system.
*Data field- all area in a computer memory or program or screen.It is a place where you can store data. Commonly used to refer to a column in a database or a field in a data entry form or web form.The field may contain data to be entered as well as data to be displayed.
*Forms- a kind of specifications of which data types are you gonna use.
*Foreign key- the uniformity and simultaneous access for your datas.is a referential constraint between two tables. The foreign key identifies a column or a set of columns in one (referencing) table that refers to a column or set of columns in another (referenced) table. The columns in the referencing table must be the primary key or other candidate key in the referenced table. The values in one row of the referencing columns must occur in a single row in the referenced table.
*Queries- Allow us to view data in different ways.is a form of questioning, in a line of inquiry.
*Records- The answered queries that you had put on or stored.
*Reports- Allow us to format a data.It is a document characterized by information or other content reflective of inquiry or investigation, which is tailored to the context of a given situation and audience.
Tuesday, July 28, 2009
Normalisation
Normalization -is a systematic way of ensuring that a database structure is suitable for general-purpose querying and free of certain undesirable characteristics—insertion, update, and deletion anomalies--that could lead to a loss of data integrity.
My Assignment
DATA TYPES 1. What are they? a. A data type (or datatype) in programming languages is a set of values and the operations on those values. 2. What roles do they play in database? a. They determine what kind of data will be processed or will become input. 3. 3 Database Management Systems Program a. Visual FoxPro Visual FoxPro is a data-centric object-oriented and procedural programming language produced by Microsoft. It is derived from FoxPro (originally known as FoxBASE) which was developed by Fox Software beginning in 1984. b. SQL SQL (Structured Query Language) (pronounced /ˌɛskjuːˈɛl/)[1] is a database computer language designed for managing data in relational database management systems (RDBMS). Its scope includes data query and update, schema creation and modification, and data access control. SQL was one of the first languages for Edgar F. Codd's relational model in his influential paper, "A Relational Model of Data for Large Shared Data Banks".[2] and became the most widely used language for relational databases[3][4] c. FoxPro FoxPro is a text-based procedurally-oriented programming language and DBMS, originally published by Fox Software and later by Microsoft, for MS-DOS, MS Windows, Apple Macintosh, and UNIX. Kinds of Data Types and Description a. integer : In more common parlance, whole number; a number that has no fractional part. b. floating-point : A number with a decimal point. For example, 3 is an integer, but 3.5 is a floating-point number. c. character (text ): Readable text
MV vs DATAF
A data field is the smallest subdivision of the stored data that can be accessed. A data field can be used to store numerical information such as price, count or a date or time, or even a data and time. A pair of data fields can be used in combination to hold a geo-spatial coordinate. Also, a data field can be used to hold a block of text. A data field takes up permanent storage within the data-store.
while..
A variable is a place to store a piece of information. Just as you might store a friend's phone number in your own memory, you can store this information in a computer's memory. Variables are your way of accessing your computer's memory.
while..
A variable is a place to store a piece of information. Just as you might store a friend's phone number in your own memory, you can store this information in a computer's memory. Variables are your way of accessing your computer's memory.
My Contrast
Data Data is raw material & unorganized facts that need to be processed . Information When data are processed, organized, structured or presented in a given context so as to make them useful, they are called Information. Data are plain facts. The word "data" is plural for "datum." When data are processed, organized, structured or presented in a given context so as to make them useful, they are called Information. It is not enough to have data (such as statistics on the economy). Data themselves are fairly useless. But when these data are interpreted and processed to determine its true meaning, they becomes useful and can be called Information. Data is the computer's language. Information is our translation of this language. Operating System The most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs. Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. Computer System A complete, working computer. The computer system includes not only the computer, but also any software and peripheral devices that are necessary to make the computer function. Every computer system, for example, requires an operating system. Data storage Computer data storage; memory, components, devices and media that retain digital computer data used for computing for some interval of time. Any data storage device; that records (stores) or retrieves (reads) information (data) from any medium, including the medium itself. Computer storage an electronic memory device; "a memory and the CPU form the central part of a computer to which peripherals are attached"
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