Relational Oracle Database Concepts
An important part of any business is keeping records. We need to keep records of our customers, our company employees emails etc. Keeping all the data separate is hard and hectic work because whenever we need records of a particular customer or employee we have to search manually.
It takes a long time and is still unreliable Here comes the idea of databases.
What is Database?
Database is software that allows you to store and retrieve information on a file system on your computer’s hard drive or other devices. A relational oracle database is an online database software that allows queries that typically use the built-in query language (SQL) to store and retrieve data.
Relative databases allow for more efficient queries that use less processing power and memory allocation as they are optimized for efficiency.
However, connecting to oracle database versions is significantly slower than just reading a simple file from your computer’s hard drive. The additional features of a relative oracle database make this speed a worthwhile drop in many situations.
Using English-like commands SQL users can easily retrieve data from the Relation oracle database online software versions without the use of complex program codes. In general, we can use SQL commands to achieve the following:
- Select: Displays the data stored in tables
- INSERT: Add rows to tables
- Delete: Remove rows from the tables
- Update: Change rows in tables
- CREATE / ALTER / DROP: Create modify or release oracle database link objects
- GRANT / REVOKE: Control the level of access of users
- Commitment / Returns: Transaction control
Each of the above SQL commands can be classified into one of the following categories:
- Select => Queries
- INSERT / UPDATE / DELETE => Data Manipulation Language (DML)
- CREATE / ALTER / DROP => Data Setup Language (DDL)
- GRANT / REVOKE => Data Control Language (DCL)
- COMMIT / ROLLBACK => These commands use DML to execute or return the transaction