SQL - Table Constraints
Why might a database designer choose to use a CHECK constraint instead of relying only on application code validation?
Why might a database designer choose to use a CHECK constraint instead of relying only on application code validation?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the role of CHECK constraints
CHECK constraints enforce rules inside the database, ensuring all data meets conditions regardless of source.Step 2: Compare with application validation
Application code can be bypassed or inconsistent; database constraints guarantee data integrity universally.Final Answer:
To enforce data rules at the database level for all data sources -> Option AQuick Check:
CHECK enforces universal data integrity [OK]
Quick Trick: Database constraints protect data beyond app code [OK]
Common Mistakes:
MISTAKES- Thinking CHECK improves performance
- Believing application code alone is enough
- Assuming CHECK allows invalid data
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