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Editorial Team
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Asked: 2026-05-31T15:29:31+00:00

First time I am trying duplicate key to have insert and update in one

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First time I am trying duplicate key to have insert and update in one query. What’s wrong with my query?

INSERT INTO tabletest(batchID, purchaseID) 
VALUES (553155, 892) ON DUPLICATE KEY 
UPDATE purchaseID = VALUES(purchaseID)

I’d like to insert or update if a batchID for a unique purchaseID exists. In the table purchaseID is UNIQUE.

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1 Answer

  1. Editorial Team

    If purchaseID is the column with the UNIQUE constraint, then you should update only batchID:

    INSERT INTO tabletest (batchID, purchaseID) 
  VALUES (553155, 892) 
ON DUPLICATE KEY UPDATE 
  batchID = VALUES(batchID)
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