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What is the purpose of the ON CONFLICT clause in a PostgreSQL INSERT statement?

easy📝 Conceptual Q1 of 15
PostgreSQL - Set Operations and Advanced Queries
What is the purpose of the ON CONFLICT clause in a PostgreSQL INSERT statement?
ATo specify what to do when a unique constraint violation occurs during insert
BTo create a new table if it does not exist
CTo delete rows that conflict with the insert
DTo select rows from another table during insert
Step-by-Step Solution
Solution:
  1. Step 1: Understand the role of ON CONFLICT

    The ON CONFLICT clause handles conflicts caused by unique constraints during an insert operation.
  2. Step 2: Identify the correct behavior

    It allows you to specify actions like DO NOTHING or DO UPDATE when a conflict occurs.
  3. Final Answer:

    To specify what to do when a unique constraint violation occurs during insert -> Option A
  4. Quick Check:

    ON CONFLICT purpose = specify conflict handling [OK]
Quick Trick: ON CONFLICT handles duplicate key errors during insert [OK]
Common Mistakes:
  • Confusing ON CONFLICT with table creation
  • Thinking ON CONFLICT deletes rows
  • Assuming ON CONFLICT selects data

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