Oracle DBA ,RAC Dataguard

SQL stand for structural query language . SQL is ANSI standard. SQL used to access and manipulate database.

Relational Database is a database in which data is stored in the form of relation. In database in simple words relation is a table that is combination of rows and column so relational database is database in which data is stored in tables.

Collection of logical related data is known as database.It is the most simple definition of database. Logical related Data:From logical related data we means that data have some relation within itself. suppose for database of Student management system we cannot put  data of employees salary because the student has no as such relation with the employees salary etc