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Answer: The STREAM function signifies that the customers table is a streaming live table, designed for continuously updating data.
The STREAM function is crucial for querying streaming data within Delta Live Tables, enabling real-time data processing and analysis. It specifies that the data is being sourced from a live, continuously updating source, such as the customers table in this scenario. This functionality is vital for applications requiring immediate data processing, like tracking loyal customers based on their most recent activities. The other options either misinterpret the STREAM function's role or inaccurately describe its application in the context of Delta Live Tables and streaming data processing.
Author: LeetQuiz Editorial Team
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A data engineer encounters the following code snippet in a project's codebase: CREATE STREAMING LIVE TABLE loyal_customers AS SELECT customer_id FROM STREAM(LIVE.customers) WHERE loyalty_level = 'high'; What is the purpose of the STREAM function in this query?
A
The STREAM function indicates that the customers table is a reference to a Structured Streaming query on a PySpark DataFrame.
B
The STREAM function is unnecessary and will trigger an error in the query.
C
The STREAM function signifies that the customers table is a streaming live table, designed for continuously updating data.
D
The data within the customers table has been modified since the query was last executed.
E
The table being created is designated as a live table.