PostgreSQL - Triggers in PostgreSQL
Which timing event is valid for a BEFORE trigger in PostgreSQL?
Which timing event is valid for a BEFORE trigger in PostgreSQL?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify valid BEFORE trigger events
BEFORE triggers can be set on INSERT, UPDATE, or DELETE events before the operation executes.Step 2: Check options for BEFORE timing
Only BEFORE DELETE is a BEFORE event; AFTER triggers happen after the operation, and INSTEAD OF is for views.Final Answer:
BEFORE DELETE -> Option BQuick Check:
BEFORE trigger valid events = INSERT, UPDATE, DELETE [OK]
Quick Trick: BEFORE triggers run before INSERT, UPDATE, or DELETE only [OK]
Common Mistakes:
- Confusing AFTER triggers as BEFORE triggers
- Using INSTEAD OF triggers on tables
- Assuming BEFORE triggers can be on SELECT
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