Oracle

 What is Oracle database?

Oracle database is a relational database management system (RDBMS) developed and marketed by Oracle Corporation. It is used to store and manage data in a structured manner.

What are the different types of database objects in Oracle?

There are several types of database objects in Oracle, including tables, views, indexes, sequences, synonyms, procedures, functions, triggers, packages, and database links.

What is a table in Oracle?

A table is a database object in Oracle that is used to store data in a structured manner. Tables consist of columns and rows, and each column represents a particular type of data, while each row represents a single instance of that data.

What is a primary key in Oracle?

A primary key is a column or combination of columns in a table that uniquely identifies each row in that table. The primary key is used to enforce data integrity and ensure that each row in the table is unique.

What is a foreign key in Oracle?

A foreign key is a column or combination of columns in a table that refers to the primary key of another table. It is used to establish a relationship between two tables and enforce referential integrity.

What is a view in Oracle?

A view is a database object in Oracle that is used to provide a customized and simplified view of data from one or more tables. Views are used to restrict access to certain columns or rows of data, and to present data in a format that is easier to understand.

What is an index in Oracle?

An index is a database object in Oracle that is used to speed up data retrieval by providing a fast access path to data in a table. Indexes are created on one or more columns of a table and are used to optimize queries that search for data based on those columns.

What is a trigger in Oracle?

A trigger is a database object in Oracle that is used to automatically execute a set of actions in response to a specific event, such as an insert, update, or delete operation on a table.

What is a package in Oracle?

A package is a database object in Oracle that is used to group related procedures, functions, variables, and other objects together into a single unit. Packages are used to organize code and simplify maintenance and development.

What is a sequence in Oracle?

A sequence is a database object in Oracle that is used to generate unique numbers in a sequential order. Sequences are often used to provide unique identifiers for rows in a table.