Introduction To Basic Database Concepts

Databases are  used in applications or devices with software that stores and retrieves information. Applications like Facebook, Twitter,Instagram,Pinterest,Snapchat,Google Hotmail Mobile phones and other portable devices all have the ability to store and retrieve data. They all are able to achieve this using a database. Places like Banks,Hospitals,Airlines Supermarkets all use databases to store and retrieve data or information. Things like your Social security number ,Hospital Records number or Bank account number are all stored in a database .

There are several concepts associated with databases and we will explore some of them in this course. We will learn about primary keys,foreign keys,schemas,Flat file database,hierarchial databases.

We interact with databases daily in our lives like when we read our emails or post something on Facebook or twitter . This course will teach you the very basics of some database concepts and the course is video based and less than1 hour.

What You Learn in this course:

• What is a Client – Server Computing

• What you will learn includes

• What is a database

• What is a Flat file database

• What is a Flat hierarchical database

• What is a RDMS

• What is a Database schema

• What is a Primary Key

• What is a Foreign key

SQL is the language used to interact with databases like Oracle  and others

SQL is a standard language for accessing and manipulating databases.

What is SQL?

SQL stands for Structured Query Language

SQL lets you access and manipulate databases

SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987

What Can SQL do?

SQL can execute queries against a database

SQL can retrieve data from a database

SQL can insert records in a database

SQL can update records in a database

SQL can delete records from a database

SQL can create new databases

SQL can create new tables in a database

SQL can create stored procedures in a database

SQL can create views in a database

SQL can set permissions on tables, procedures, and views

SQL is a Standard - BUT....

Although SQL is an ANSI/ISO standard, there are different versions of the SQL language.  However, to be compliant with the ANSI standard, they all support at least the major commands (such as SELECT, UPDATE, DELETE, INSERT, WHERE) in a similar manner.

Note: Most of the SQL database programs also have their own proprietary extensions in addition to the SQL standard!