Integrity constraints in relational databases are crucial for data accuracy, consistency, and reliability. They include Domain, Entity, and Referential Integrity Constraints, each serving to ensure data uniformity, uniqueness, and consistent relationships across tables. Complex constraints and triggers further enhance data integrity, while the ability to alter and drop constraints allows for database adaptability.
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Domain Integrity Constraints limit data entry to a set of permissible values, ensuring uniformity across a column
Entity Integrity Constraints prevent the occurrence of duplicate and null values in primary key columns, thus uniquely identifying each record
Referential Integrity Constraints maintain the consistency of data relationships across tables by linking foreign keys to primary keys in other tables
Domain Integrity Constraints specify the permissible format, type, and range of data for a database column, thereby guaranteeing that data values remain consistent and adhere to defined standards
Entity Integrity Constraints are vital for ensuring that each row in a database table can be uniquely identified
Referential Integrity Constraints uphold the consistency of data relationships between tables within a relational database
Custom constraints can be defined using SQL's CHECK constraint to enforce custom rules not covered by the predefined constraints
Triggers are automated database procedures that activate in response to certain events, such as INSERT, UPDATE, or DELETE operations
It is imperative to ensure that any changes to constraints do not compromise the overall data integrity of the database
SQL provides several referential actions, such as CASCADE, SET NULL, SET DEFAULT, and NO ACTION, which define the behavior of related tables when changes occur in a primary key
It is critical to maintain referential integrity when performing updates and deletions to ensure ongoing data consistency
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______ Integrity Constraints ensure that each record is uniquely identified by prohibiting duplicates and nulls in primary key columns.
Entity
01
______ Integrity Constraints preserve data relationship consistency by connecting foreign keys to primary keys in different tables.
Referential
02
Domain Integrity: Data Format
Specifies acceptable data format for a column, ensuring data adheres to predefined formats.
