PostgreSQL - Triggers in PostgreSQL
What is the main purpose of a
BEFORE trigger in PostgreSQL?What is the main purpose of a BEFORE trigger in PostgreSQL?
easy📝 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand trigger timing
BEFORE triggers execute before the actual data change happens in the table.Step 2: Identify trigger purpose
They allow checking or modifying data before it is saved, preventing bad data if needed.Final Answer:
To run custom code before data is inserted or updated -> Option CQuick Check:
BEFORE trigger = runs before data change [OK]
Quick Trick: BEFORE triggers run before saving data [OK]
Common Mistakes:
- Confusing BEFORE with AFTER triggers
- Thinking triggers create or delete tables
- Assuming triggers run only after data changes
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