Different Types Of Constraints In Dbms
different categories of constraints in database management systems
Different Types Of Constraints In Dbms
In database management systems, constraints are rules that define and enforce the integrity of data in a database. There are various types of constraints used to maintain data accuracy, consistency, and reliability. These include primary key constraints that uniquely identify each record in a table, foreign key constraints that enforce referential integrity between tables, unique constraints that ensure uniqueness of values in a column, check constraints that define specific conditions for data entry, and not null constraints that require a column to always contain a value. Constraints play a crucial role in maintaining data quality and consistency in a database by enforcing rules that prevent invalid or incorrect data from being entered.
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1 - Entity Integrity Constraint:
Ensures the uniqueness of primary key values in a table, preventing duplicate entries.
2) Referential Integrity Constraint:
Maintains the consistency between related tables by enforcing relationships between foreign keys and primary keys.
3) Domain Constraint:
Defines the permissible values for a specific attribute, ensuring data integrity and accuracy.
4) NOT NULL Constraint:
Restricts a column from containing NULL values, requiring it to have a valid data entry.
5) Check Constraint:
Specifies conditions that data in a column must meet, providing validation for values entered into the database.
6) Unique Constraint:
Ensures that all values in a column are unique, preventing duplicates within the specified scope.
7) Primary Key Constraint:
Combines the benefits of unique and NOT NULL constraints, uniquely identifying each record in a table.
8) Foreign Key Constraint:
Establishes a link between two tables, enforcing referential integrity by requiring values in one table to match those in another.
9) Default Constraint:
Sets a default value for a column when no specific value is provided during data insertion.
10) Cascade Constraint:
Specifies the actions to be taken on related rows in child tables when a corresponding row in a parent table is updated or deleted.
These constraints play a crucial role in maintaining data accuracy, consistency, and integrity within a database management system, ensuring that data remains reliable and valid.
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