PostgreSQL - Triggers in PostgreSQL
A trigger is set to update a timestamp column on every row update. What will be the result after updating a row?
A trigger is set to update a timestamp column on every row update. What will be the result after updating a row?
medium📝 query result Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand trigger purpose for timestamp update
Triggers can automatically modify columns like timestamps when a row is updated.Step 2: Evaluate options
The timestamp column will update automatically to current time correctly describes the expected behavior. Options A, B, and D describe incorrect or harmful outcomes.Final Answer:
The timestamp column will update automatically to current time -> Option BQuick Check:
Update trigger = Auto timestamp update [OK]
Quick Trick: Update triggers can auto-change columns like timestamps [OK]
Common Mistakes:
- Expecting update failure due to triggers
- Thinking triggers do not change data
- Assuming triggers delete rows
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