Home Pricing Archive About Privacy

Integrity Constraints Overview

📑 5 slides 👁 83 views 📅 3/12/2026
0.0 (0 ratings)

Introduction to Integrity Constraints

Integrity constraints ensure data accuracy and reliability in databases.

Introduction to Integrity Constraints
2

Primary Key Constraints

  • Primary keys uniquely identify each record in a table.
  • They prevent duplicate or null values in the specified column(s).
  • Example: Student ID in a student database table must be unique.
Primary Key Constraints
3

Foreign Key Constraints

  • Foreign keys create relationships between tables in a database.
  • They ensure referential integrity between related data.
  • Example: Order table must reference valid customer IDs from Customer table.
Foreign Key Constraints
4

Unique & Check Constraints

  • Unique constraints prevent duplicate values in non-primary key columns.
  • Check constraints validate data meets specific conditions before insertion.
  • Example: Email addresses must be unique and contain '@' symbol.
Unique & Check Constraints
5

Importance of Integrity Constraints

  • They maintain data accuracy and prevent corruption.
  • Constraints help enforce business rules at database level.
  • Proper use reduces application errors and improves data quality.
Importance of Integrity Constraints
1 / 5