database managment system

1. NAME =ARNAB PODDER
COURSE=BCA
SEMESTER=4
SUBJCT= Database Management
System (DBMS).
UNIVERSITYRIOLL NO=18301221029
CA1 EXAM

2. What is DatabaseManagementSystem?
•A database management system (or DBMS) is
essentially nothing more than a computerized data-
keeping system.
• Users of the system are given facilities to perform
several kinds of operations on such a system for
either manipulation of the data in the database or
the management of the database structure itself.
•Database Management Systems(DBMSs) are ca
tegorized according to their data structures or types.

3. Advantages Of Database Management System
A databasemanagement system helps improve organizational security, integration,
compliance, and performance.
• Improved data sharingand datasecurity.
• Effective data integration.
• Consistent,reliable data.
• Data that complies with privacy regulations.
• Increased productivity.
• Better decision-making.

4. Various Structured Query Language commands
There are five types of SQL
commands:
•DDL,
•DML,
•DCL,
•TCL,
• DQL

5. KEY CONSTRAINTS IN DBMS
The following constraints are commonly used in SQL:
•NOT NULL - Ensures that a column cannot have a NULL value.
•UNIQUE - Ensures that all values in a column are different.
•PRIMARY KEY - A combination of a NOT NULL and UNIQUE. Uniquely
identifies each row in a table.
•FOREIGN KEY - Prevents actions that would destroy links between
tables.
•CHECK - Ensures that the values in a column satisfies a specific
condition.
•DEFAULT - Sets a default value for a column if no value is specified.
•CREATE INDEX - Used to create and retrieve data from the database
very quickly

6. KEYWORDS IN PYTHON
• Value Keywords: True, False, None.
• Operator Keywords: and, or, not, in, is.
• Control Flow Keywords: if, elif, else.
• Iteration Keywords: for, while, break, continue, else.
• Structure Keywords: def, class, with, as, pass, lambda.
• Returning Keywords: return, yield.
• Import Keywords: import, from, as.