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Why are constraints important in a database?

easy📝 Conceptual Q11 of 15
SQL - Table Constraints
Why are constraints important in a database?
AThey make the database run faster by skipping checks.
BThey automatically delete old data to save space.
CThey allow users to enter any data without restrictions.
DThey ensure data accuracy and prevent invalid data entry.
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of constraints

    Constraints are rules that keep data correct and reliable by preventing wrong data from being saved.

  2. Step 2: Compare options with constraint purpose

    Only They ensure data accuracy and prevent invalid data entry. correctly states that constraints ensure data accuracy and prevent invalid data entry.

  3. Final Answer:

    They ensure data accuracy and prevent invalid data entry. -> Option D

  4. Quick Check:

    Constraints = Data accuracy and validity [OK]
Quick Trick: Constraints keep data clean and correct [OK]
Common Mistakes:
MISTAKES
  • Thinking constraints speed up database by skipping checks
  • Believing constraints allow any data without limits
  • Assuming constraints delete data automatically

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