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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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