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Prevent Duplicate Entries to enter to delta lake Storage

User16826994223
Honored Contributor III

I have a data frame and I write this data frame to adls table, next day I get an updated data frame which has some records from the past also and i want to update the delta table without creating duplicate

1 REPLY 1

User16826994223
Honored Contributor III

This is a task for Merge command - you define condition for merge (your unique column) and then actions.

MERGE INTO target
USING  src
ON target.column = source.column
WHEN MATCHED THEN
  UPDATE SET *
WHEN NOT MATCHED
  THEN INSERT *

could be your dataframe registered as temporary view):

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