This also applies to nested columns with a value of null. ![]() ![]() When a CDC event matches an existing rowĪnd IGNORE NULL UPDATES is specified, columns with a null will retain their existing values in the target. Using the WHERE clause is optional and should be used when your processing requiresĪllow ingesting updates containing a subset of the target columns. This condition cannot be used to drop source rows all CDC rows in the source must satisfy this condition orĪn error is thrown. Which CDC events apply to specific records in the target table.Ī condition applied to both source and target to trigger optimizations such as partition pruning. The column or combination of columns that uniquely identify a row in the source data. See Change data capture with Delta Live Tables. When specifying the schema of the APPLY CHANGES target table, you must also include the _START_AT and _END_AT columns with the same data type as the sequence_by field. You can optionally specify the schema for your target table. You must declare a target streaming table to apply changes into. Violate the constraint to the target dataset.įAIL UPDATE: Immediately stop pipeline execution.ĭROP ROW: Drop the record and continue processing. If ON VIOLATION constraint is not defined, add rows that The system will default to the pipeline storage location.Ī Delta Live Tables query that defines the dataset for the table.ĭefine data quality constraint expectation_name. The input dataset must be a streaming data source, forĮxample, Auto Loader or a STREAMING table.Īn optional list of one or more columns to use forĪn optional storage location for table data. No metadata is persisted forĬreate a table that reads an input dataset as a stream.
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