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The fill nulls transformation replaces null values in a column with a specified default value.

When to Use

  • The destination does not accept nulls (e.g. NOT NULL constraint).
  • You want a fallback for missing values (e.g. ‘Unknown’ for null country).
  • Analytics require a default (e.g. 0 for null numeric columns).

Example

Fill nulls in country with 'Unknown':
BeforeAfter
USAUSA
nullUnknown
UKUK

Configuration

Specify the column and the default value. The default must match the column type (string, number, etc.).