Explanation:
The correct answer is B: The record will not be inserted in the table and an error message will be displayed.
Here's why:
Data Definition vs. Data Manipulation:
CREATE TABLE ... USING CSV statement defines a table based on the data in the venues.csv file. This creates a table in the Delta Lake format (or a similar format depending on your environment), not just a simple table linked to the CSV file.Inserting into a Delta Table:
INSERT INTO statements. However, these statements directly insert data into the table itself, not back into the original CSV file.In essence:
CREATE TABLE ... USING CSV statement reads the CSV and creates a structured table within your data warehouse.INSERT INTO statements add new rows to that structured table, not the original CSV file.Note:
This clarifies how data is handled when creating tables from external files and then inserting data into those tables.
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A data engineer is tasked with creating a table from a venues.csv file located at dbfs:/FileStore/data/. The engineer successfully executes the following SQL statement to create the table:
CREATE TABLE venues
(name STRING, area INT)
USING CSV
LOCATION 'dbfs:/FileStore/data/'
CREATE TABLE venues
(name STRING, area INT)
USING CSV
LOCATION 'dbfs:/FileStore/data/'
Subsequently, the engineer attempts to add a record to the table using the INSERT INTO command. What will be the outcome of this command?
A
The record will be added to the venues table, and a new CSV file will be created in the dbfs:/FileStore/data/ directory.
B
The record will not be added to the table, and an error message will be shown.
C
The record will be added to both the table and the venues.csv file.
D
The record will not be added to the table, but a confirmation message will be displayed.
E
The record will be added to the venues.csv file but not to the venues table.