[Solved] You wrote a row-level trigger but it fires only once per statement. What is the likely cause? — Ans: Trigger was created with FOR EACH STATEMENT instead of FOR EACH ROW. | PostgreSQL

PostgreSQL - Triggers in PostgreSQL

You wrote a row-level trigger but it fires only once per statement. What is the likely cause?

ATrigger was created with FOR EACH STATEMENT instead of FOR EACH ROW.

BTrigger function is missing RETURN statement.

CTrigger is defined on the wrong table.

DTrigger timing is AFTER instead of BEFORE.

Step-by-Step Solution

Solution:

Step 1: Identify trigger firing frequency
Row-level triggers must be created with FOR EACH ROW to fire per row.
Step 2: Check trigger creation syntax
If FOR EACH STATEMENT is used, trigger fires once per statement, not per row.
Final Answer:
Trigger was created with FOR EACH STATEMENT instead of FOR EACH ROW. -> Option A
Quick Check:
FOR EACH ROW required for row-level triggers [OK]

Quick Trick: FOR EACH ROW needed for row-level triggers [OK]

Common Mistakes:

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You wrote a row-level trigger but it fires only once per statement. What is the likely cause?