Advanced Database Systems - Presentation 1 with quiz.pptx
- 1. Advanced Database Systems INSTRUCTOR: ELLEN GRACE PORRAS FIRST SEMESTER 2022-2023
- 2. OVERVIEW Welcome to the first module of this course on the Advanced Database Systems! Understanding of SQL and its capabilities for querying a single table a prerequisite. In this subject, you will learn how to retrieve data from multiple tables using one SQL statement. You will see how tables can be joined together and how similar results are obtained using different approaches, including the joints and sub queries. It is important that you understand how to query multiple tables for generating appropriate reports in the creation of an information system. Advanced Database Systems
- 3. Learning Outcomes 3 After studying our lesson, you should be able to: 1. Concisely define database 2. Examples of tables 3. Define differences between data and information 4. Define RDMS Advanced Database Systems
- 4. INTRODUCTION 4 ADVANCED DATABASE Most modern enterprises except some small ones have data that they need to store in ways which will be easy to retrieve later. One of the most common types of database is a list of names and addresses of people who regularly deal with the enterprise. Originally when a business is small such lists may have been written on paper, then in a word processor or spreadsheet, but as the business and lists grow it becomes difficult to deal with the information stored in a word processor or a spreadsheet. Database technology may then be required. Advanced Database Systems
- 5. 5 Advanced Database Systems A simple example of a database is presented below. Table 1.1 Example of a simple database EMPLOYEE_ID FIRST_NAME LAST_NAME SALARY 100 Steven King 24000 101 Neena Frago 17000 102 Lex De Vera 17000 103 Alexander Green 9000 104 Bruce Lee 6000 105 David Austin 4800 AN EXAMPLE OF A DATABASE
- 6. 6 Advanced Database Systems • A structured collection of related data • A filing cabinet, an address book, a telephone directory, a timetable, etc. • Google and your email is a database • School Student Information System What is a Database?
- 7. 7 Advanced Database Systems Data – a collection of facts made up of text, numbers and dates: Ex. Murray 35000 7/18/86 Information - the meaning given to data in the way it is interpreted: Ex. Mr. Murray is a sales person whose annual salary is P35,000 and whose hire date is July 18, 1986. Data vs. Information
- 8. 8 Advanced Database Systems • Table A set of related records • Record A collection of data about an individual item • Field A single item of data common to all records Basic Database Concepts Name: Barry Harris College: Medicine Tel: 392-5555 Name: Barry Harris College: Medicine Tel: 392-5555 Name: Barry Harris
- 9. 9 Advanced Database Systems An Example of a Table EMPLOYEE_ID FIRST_NAME LAST_NAME SALARY 100 Steven King 24000 101 Neena Frago 17000 102 Lex De Vera 17000 103 Alexander Green 9000 104 Bruce Lee 6000 105 David Austin 4800 Fields Records
- 10. 10 Advanced Database Systems Primary Keys & Foreign Keys EMPLOYEE_ID FIRST_NAM E LAST_NAME SALARY 100 Steven King 24000 101 Neena Frago 17000 102 Lex De Vera 17000 103 Alexander Green 9000 104 Bruce Lee 6000 105 David Austin 4800 • To ensure that each record is unique in each table, we can set one field to be a Primary Key field. • A Primary Key is a field that that will contain no duplicates and no blank values. • Foreign Keys link to data in other tables
- 11. 11 Advanced Database Systems A relational database is a collection of tables from which data can be accessed in many ways without having to reorganize the database tables. DON’T DUPLICATE DATA That is, once relationships are created, tables can “talk” to each other. We can link (relate) the tables to find: • Which schools are in a system? • Which students are in which class? • Which classes are filling up? What is a Relational Database Management System (RDMS)?
- 13. 13 Advanced Database Systems Input Data with Forms • A friendlier view of the database • Used for data input, menus, display and printing • Can perform Calculations and Combine fields
- 14. 14 Advanced Database Systems Structured Query Language (SQL) What is SQL? Is a language of database, it includes database creation, deletion, fetching rows and modifying rows etc. SQL is an ANSI (American National Standards Institute) standard, but there are many different versions of the SQL language. SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in relational database.
- 15. 15 Advanced Database Systems Why SQL? • Allows users to access data in relational database management systems. • Allows users to describe the data. • Allows users to define the data in database and manipulate that data. • Allows users to create and drop databases and tables. • Allows users to create view, stored procedure, functions in a database. • Allows users to set permissions on tables, procedures and views
- 16. 16 Advanced Database Systems History: • 1970 -- Dr. E. F. "Ted" of IBM is known as the father of relational databases. He described a relational model for databases. • 1974 -- Structured Query Language appeared. • 1978 -- IBM worked to develop Codd's ideas and released a product named System/R. • 1986 -- IBM developed the first prototype of relational database and standardized by ANSI. The first relational database was released by Relational Software and its later becoming Oracle.
- 17. 17 Advanced Database Systems SQL Syntax • SQL is followed by unique set of rules and guidelines called Syntax. This tutorial gives you a quick start with SQL by listing all the basic SQL Syntax: • All the SQL statements start with any of the keywords like SELECT, INSERT, UPDATE, DELETE, ALTER, DROP, CREATE, USE, SHOW and all the statements end with a semicolon (;). • Important point to be noted is that SQL is case insensitive, which means SELECT and select have same meaning in SQL statements, but MySQL makes difference in table names. So if you are working with MySQL, then you need to give table names as they exist in the database.
- 18. 18 Advanced Database Systems Database Tables A database most often contains one or more tables. Each table is identified by a name (e.g. "Customers" or "Orders"). Tables contain records (rows) with data. Below is an example of a table called “Employees": Employee_Id LastName FirstName Address Municipality 1 Janoba Ryan Dave Tabon Quezon 2 Cortado Herlaine Underground 1 Quezon 3 Porras Ellen Grace Underground 1 Quezon The table above contains three records (one for each person) and five columns (Employee_Id, LastName, FirstName, Address, and Municipality).
- 19. Thank you Presenter name: Ellen Grace D. Porras Email address: egporras@psu.palawan.edu.ph This Photo by Unknown Author is licensed under CC BY-SA-NC
- 20. 20 Advanced Database Systems Quiz Time! Goodluck!
- 21. 21 Advanced Database Systems 1. What is Database? 2. Difference between Data and Information? 3. Give at least 3 examples of a Data and Information. 4. What is SQL? 5. __________a field that that will contain no duplicates and no blank values. 6. What are the 3 Basic Database Concept?