Constraints are sort of restrictions, which restrict the data that can be stored in a relation (Table). or
Constraints are mostly a collection of indexes and triggers that restrict certain actions on a table. There are four types of constraints:
Primary Key ConstraintsUnique ConstraintsCheck ConstraintsForeign Key (FK) Constraints.
- chandrabhan
1.what is a Relationship in database management system?
Relation Database Management System
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database management system (DBMS)
Logical Structure of database is know as database schema. All database entities are defined and relation between then is represented in structured way. It includes all constraints to be apply on each identity.
Schema means structure of the databse. Like, tables, constraints, relation
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database management is a system
Database management system is a software system that creates,expands and maintains the database.
No. Database is a data itself, organized according to rules of database management system. And Database Management System is a software used to organize a database, and to acces it too.
Functions of a typical database management system?
the database management system analysis the data or record but relational database management system links the database to each other.
Relational Database Management System Relational Database Management System
A database is a collection of data. A database management system controls how those data are collected, stored and retrieved.
four differences between fileprocessing system and database management system
Relational database system supports general constraints in the form of assertions,assertions involve several table and are checked whenever modification is done,assertions can use the full power of SQL queries to specify the desired restrictions.
A system that allows you maintain and administer a database.