Oracle database is one of the top and most widely used relational database management systems in the world .
This more advanced beginners course will teach you how to retrieve data from an oracle database.
We will start off by downloading and installing oracle database 11g express which is free to use. Then we will install TOAD which is a tool we will be using to connect to the oracle database and interact with it.
Topics we will cover in this course includes:
Retrieving Data with Aggregate Functions
Introduction to aggregate functions
Using AVG function
Using COUNT function
Using MAX function
Using MIN function
Retrieving Data with Table Joins
Introduction to Table Joins
Using Equi Joins
Using Non Equi Joins
Using Cartesian Join
Using Outer Join
Using Self Join
Retrieving Data with Analytic Functions
Introduction to Analytic Functions
Partition By Clause
First and Last Function
Row number Functions
Dense Rank Function
By the end of this course you will have enough skill to write more complex queries on an oracle database.
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!
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