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SQL Query Help Using Oracle

Updated: Oct 6, 2021

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Overview of Oracle

Database is a collection of data treated as a unit. A database management system (DBMS) stores, manages and retrieves a large amount of data in a multi-user environment so that many users can access the same data concurrently.

Oracle Database is an object relational database that provides efficient and effective solutions for database users such as delivering high performance, protecting users from unauthorized access, and enabling fast failure recovery.

Human Resources schema Sample

A database schema is a collection of metadata that describes the relationship between the data in a database. A schema can be simply described as the "layout" of a database or the blueprint that outlines how data is organized into tables.

Schema objects (Table, Indexes, views etc) are database objects that contain data. By using these object we perform operations on data. each schema object belongs to a specific schema.

The following are commonly used schema objects:

  • Tables: Basic units of data storage in an Oracle database. Here, data is stored in rows and columns. You define a table with a table name and a set of columns.

  • Indexes: Performance-tuning methods for allowing faster retrieval of records.

  • Views: Representations of SQL statements that are stored in memory so that they can be reused.

The Human Resources (HR) schema is part of the Oracle Sample Schemas that you can install with Oracle Database.

Human Resources (HR) schema is part of the Oracle Sample Schemas
Human Resources (HR) schema is part of the Oracle Sample Schemas

The schema contains the following tables:

  • The REGIONS table contains rows that represent a region such as the Americas or Asia.

  • The COUNTRIES table contains rows for countries, each of which is associated with a region.

  • The LOCATIONS table contains the specific addresses for the offices, warehouses, or production sites of a company in a particular country.

  • The DEPARTMENTS table contains details about the departments in which employees work. Each department may have a relationship representing the department manager in the EMPLOYEES table.

  • The EMPLOYEES table contains details about each employee who works in a department. Some employees may not be assigned to a department.

  • The JOBS table contains the job types that an employee can hold.

  • The JOB_HISTORY table contains an employee's job history.


SQL Command to connect oracle Database

Connect command:

There are two ways through which you can connect to oracle database.

Syntax: connect username/password;

Example 1 :
    SQL> connect  user1/password1

Example 2:
    SQL> connect
    Enter User-name: user1
    Enter password: password1

Disconnect: This command is use to logout from current user connected

Example :
    SQL> disconnect;
    Disconnected from Oracle Database 10g ......

show username: This will show username on command prompt.

         SQL> show user:
         USER is "user1"

create user:


      CREATE USER <user name> IDENTIFIED BY <password>.

Example :

Change password:

Example 1:

Example 2:

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