Writing Advanced SQL Queries on Oracle

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 
The Syntax 
Partition By Clause 
First and Last Function 
Row number Functions 
Dense Rank Function 
Lag Function 
LEAD Function 
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!