by Dexter | Dec 5, 2020 | Oracle SQL
Introduction: WHERE clause is used in Oracle to limit the rows in output using one or more conditions. Sometimes we need only limited data from the columns, instead of entire rows. We use WHERE clause to filter the data. SELECT column_names FROM table_name WHERE...
by Dexter | Dec 5, 2020 | Oracle SQL
Oracle Dual Table is a special table designed to give instant result for queries that don’t require a table. Suppose we want to perform a arithmetic calculations or want to call functions, then we don’t need to fetch data from any table. Example: SELECT 30...
by Dexter | Dec 5, 2020 | Oracle SQL
When we use SELECT statement to retrieve rows, it may also include duplicate rows. We use SELECT DISTINCT statement to filter all the duplicate rows and to get only unique values. The syntax of SELECT DISTINCT statement is as follows: SELECT DISTINCT column_1 FROM...
by Dexter | Dec 5, 2020 | Oracle SQL
Introduction SELECT is one command that you will use the most while working with Oracle Database. It is used to fetch data from table and display what we want. We use SQL queries to show only relevant information. For example, let us consider the Employees Table from...
by Dexter | Dec 5, 2020 | Oracle SQL
BODMAS Bodmas is an acronym for Brackets, Orders, Division, Multiplication, Addition and Subtraction. Any arithmetic operation in SQL follows this fundamental maths logic. We use this rule to decide, which mathematical operator should be given precedence first while...
by Dexter | Dec 5, 2020 | Oracle SQL
In this tutorial, we will learn how to create a new user and connection in SQL developer. We will also learn how to unlock HR account and understand more about HR schema. This article is divided in 3 parts: Create a New Connection for SYS userCreate a New Connection...
