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What happens when an INSERT trigger is defined as BEFORE INSERT on a table?

easy📝 Conceptual Q1 of 15
SQL - Triggers
What happens when an INSERT trigger is defined as BEFORE INSERT on a table?
AThe trigger runs after the new row is inserted into the table
BThe trigger runs before the new row is inserted into the table
CThe trigger prevents any insert operation on the table
DThe trigger runs only if the insert fails
Step-by-Step Solution
Solution:
  1. Step 1: Understand trigger timing

    BEFORE INSERT triggers execute before the actual insert happens.
  2. Step 2: Apply timing to the insert operation

    This means the trigger code runs first, allowing modification or validation before insertion.
  3. Final Answer:

    The trigger runs before the new row is inserted into the table -> Option B
  4. Quick Check:

    Trigger timing = BEFORE INSERT [OK]
Quick Trick: BEFORE triggers run before data insertion [OK]
Common Mistakes:
  • Confusing BEFORE and AFTER trigger timing
  • Thinking triggers block inserts by default
  • Assuming triggers run only on failed inserts

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