SQL Commands and Statements
admin
SQL commands are instructions used to perform specific tasks in a database. SQL statements are categorized into different types based on their functions. 1. DDL (Data Definition Language) DDL commands…
oracle
what is SQL and SQL* plus?
What is SQL? SQL (Structured Query Language) is a standard language used to communicate with relational databases. It is used to create, store, retrieve, update, and delete data from databases.…
Integrity Constraints
The constraints you listed are Integrity Constraints in DBMS/RDBMS. They help maintain the accuracy and consistency of data. 1. NOT NULL Constraint Ensures that a column cannot have a NULL…
what is database ?and difference between dbmas and rdbms.
What is a Database? A Database is an organized collection of related data that is stored electronically and can be easily accessed, managed, and updated. Example: A college database may…
Dr.E.F.Codd Rules
Dr. E. F. Codd’s 12 Rules of Relational Database Management Systems (RDBMS) Dr. Edgar F. Codd proposed these rules to define what a true Relational Database Management System should be.…