[Solved] What does the ON CONFLICT DO NOTHING clause do in a PostgreSQL INSERT statement? — Ans: It skips inserting the row if a conflict occurs on a unique key. | PostgreSQL

PostgreSQL - Set Operations and Advanced Queries

What does the ON CONFLICT DO NOTHING clause do in a PostgreSQL INSERT statement?

AIt skips inserting the row if a conflict occurs on a unique key.

BIt updates the existing row with new values on conflict.

CIt deletes the conflicting row before inserting the new one.

DIt raises an error and stops the insert operation.

Step-by-Step Solution

Solution:

Step 1: Understand ON CONFLICT behavior
The ON CONFLICT DO NOTHING clause tells PostgreSQL to ignore the insert if a duplicate key conflict happens.
Step 2: Compare with other conflict actions
Unlike DO UPDATE which modifies existing rows, DO NOTHING simply skips the insert without error.
Final Answer:
It skips inserting the row if a conflict occurs on a unique key. -> Option A
Quick Check:
ON CONFLICT DO NOTHING = skip insert on duplicate [OK]

Quick Trick: DO NOTHING skips duplicates silently, no error thrown [OK]

Common Mistakes:

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What does the ON CONFLICT DO NOTHING clause do in a PostgreSQL INSERT statement?