Databricks Data Engineer Associate Question 94
Single answerYou are working on a Databricks SQL query to process data stored in a Delta table. You notice that the query includes the following structure: SELECT * FROM delta. What does the prefix delta. indicate in this context?
- A
The query is referencing a Delta Lake table.
- B
The query is using a Delta-specific SQL dialect.
- C
The query is referencing a stream of data from Delta Lake.
- D
The query is referencing a file stored in the Delta format.
Show answer and explanation
Correct answer: A
Explanation
In Databricks SQL, the prefix delta. after the FROM keyword is used to specify that the query is operating on a Delta Lake table. This is an identifier for the data source type, which is critical for determining the operations and optimizations available during query execution.
- A. Correct.
Correct: The prefix
delta.is used to indicate that the query is referencing a Delta Lake table. This is specific to Delta Lake's integration with Databricks SQL. - B. Incorrect.
Incorrect: The prefix does not indicate a Delta-specific SQL dialect. It specifies the underlying data source being queried.
- C. Incorrect.
Incorrect: The prefix does not specifically reference a stream. It is used to denote a Delta Lake table, which can support both batch and streaming queries.
- D. Incorrect.
Incorrect: While Delta tables are stored in Delta format, the prefix
delta.does not directly reference a file. It refers to a Delta Lake table in the catalog.