Isys104 Tutorial – Week 7

Data objects can model relational data or advanced data types such as graphics, movies, and audio. Smalltalk, C++, Java, and others are objects used in object-oriented data. The object-relational is a combination of relational and object-oriented databases. Traditional and advanced data types can be used to construct database management systems. These systems can connect to a company’s website and update records as needed. Database Approach The main purpose of a database is data storage that can be stored and retrieved when needed. A popular common language called structured query language (SQL) is used to store and retrieve data in relational database. This language enables the systems to run a report or modify data or remove the data from the database. A database management system (DBMS) controls all aspects of a database, this is not limited to the creation, maintenance, and use of database. The DBMS ensures proper applications are able to access the database. An important purpose of a DBMS is to maintain the data definitions (data dictionary) for all the data elements in the database. It also enforces data integrity and security measures. Data Models Data models provide a contextual framework and graphical representation that aid in the definition of data elements. In a relational database, the data model lays the foundation for the database and identifies important entities,

Be sure to provide a detailed explanation of relational databases along with their associated business advantages.

* Describe the role of databases and database management systems in managing organizational data and information.

The lab begins with a simple example of query development using Access; then, evolves to more complex queries which the student should perform after completing the first exercise. The student can create a query with the wizard, with query design view, or with SQL statements. The Northwind database will be used again in this lab.

A relational database is a database that consists of a collection of tables with columns showing entities, and rows showing data. This type of database uses a primary key and foreign key. The foreign key in another table will point to the primary key of a table, and this is how tables can relate to each other. This permits for one-to-one, one-to-many, and many-to-many relationship between the data. An advantage of relational databases includes the ease of adding or modifying new tables and entities without needing to change the structure of the database already in place. Relational database have many features, including indexing, setting data type, and setting validation tests, all these help to ensure data integrity.

General a database has a lot of tables and some tables are related to each other so relationship is use to make the connection between two or more tables. It is a method to avoid excessive data and to ensure the data integrity. There have three types of relationships:

1) The SQL CREATE TABLE statement is used to name a new table and describe the table's columns.

Relational data is when you can put data in a computer one time and it grows

The tables in relational databases organize data in rows and columns, simplifying data access and manipulation. It is easier for manager to understand the relational model than put all data in one table. Besides, a relational database allows tables to be linked. And the linkage reduces data redundancy and allows data to be organized more logically. In a word, relational database is easier to control, more flexible, and more intuitive than approaches.

Course Description This course covers database concepts. Topics include data analysis, the principal data models with emphasis on the relational model, entity-relationship diagrams, database design, normalization, and database administration. Policies Faculty and students will be held responsible for understanding and adhering to all policies contained within the following two documents: • • University policies: You must be logged into the student website to view this document. Instructor policies: This

these constructs in SQL, the lab does not explain in full the theory behind the

Example 1 – Consider the following relational database for the Super Baseball League. It keeps track of teams in the league, coaches and players on the teams, work experience of the coaches, bats belonging to each team, and which players have played on which teams. Note the following facts about this environment:

Secondly the purpose of a database for Ian’s & Co is that basically you can make a lot of queries, forms, tables, and also even reports so that the users can basically report hardware trouble across the two cite. Secondly the company Ian’s and Co will also need desk that are also linked to other desks so that they can keep an eye on the hardware that are having quite a few problems , in addition this will progress the service which is provided to the users and also to make sure the service is operated in an efficient way.

Databases allow us to easily store and retrieve data in a purely digital format. The strength of this is that large amounts of data can be stored and retrieved with minimal effort on the part of the user. Opposed to manually flipping through files, one can quickly pull up the requested data through a computer program. Many systems that were conventionally paper and file based have been converted to a digital format which are now stored in one or more databases.

Structured Query Language, commonly referred to as SQL, is a programming language that is used to communicate with and handle databases. In order to maximize the outputs that they get from the huge amount of data collected, many companies and establishments employ IT professionals well-versed in SQL. SQL programs are adopted and used by companies in order to access and influence the data and information that is maintained in their databases, as well as for generating and modifying new tables.