View Full Databricks Certified Data Analyst Associate Exam Dumps and Practice Test Dumps.

 

Question 81

What is the primary benefit of using views in Databricks SQL?

1. To store pre-computed physical copies of data on disk
2. To save complex query logic as a virtual table for reuse and simplified reporting
3. To replace Delta Lake transaction logs
4. To encrypt cloud storage buckets automatically

Correct Answer: 2

Explanation

Views are virtual tables defined by a SQL query. They allow analysts to encapsulate complex join logic, aggregations, or security filters into a single reusable object, simplifying downstream queries and dashboard creation without duplicating physical data storage.

Question 82

Which function is used to return the current date in Databricks SQL?

1. NOW()
2. CURRENT_DATE()
3. TODAY()
4. GETDATE()

Correct Answer: 2

Explanation

The CURRENT_DATE() function returns the current date based on the SQL session timezone in standard YYYY-MM-DD format. It is commonly used for filtering real-time transactional data or calculating dynamic date ranges in reports.

Question 83

What does the LIMIT clause do when combined with ORDER BY?

1. It returns only the top N sorted records, such as the top 10 highest sales.
2. It deletes all sorted records permanently.
3. It reverses the sort order automatically.
4. It throws a syntax error exception.

Correct Answer: 1

Explanation

Combining ORDER BY with LIMIT allows analysts to retrieve top-N or bottom-N analyses efficiently (e.g., finding the top 5 customers by revenue). The engine sorts the dataset first and then returns only the specified number of top rows.

Question 84

Which SQL keyword is used to assign a temporary name or alias to a table or column?

1. AS
2. NAMED
3. TO
4. RENAME

Correct Answer: 1

Explanation

The AS keyword is used to create temporary aliases for columns or tables in SQL queries (e.g., SELECT count(*) AS total_orders). Aliasing improves readability, especially when using table prefixes or aggregate functions.

Question 85

What is the main purpose of Delta Lake schema evolution?

1. To allow users to add new columns to an existing table automatically during write operations
2. To delete table schemas permanently
3. To convert tables into CSV flat files
4. To restrict all write operations

Correct Answer: 1

Explanation

Schema evolution (mergeSchema = true) allows incoming data structures to adapt safely by automatically adding new columns or expanding data types without failing the data pipeline or corrupting historical table structures.

Question 86

Which function calculates the total sum of a numeric column?

1. SUM()
2. TOTAL()
3. ADD()
4. COUNT()

Correct Answer: 1

Explanation

The SUM() aggregate function calculates the mathematical sum of all non-null values in a specified numeric column, serving as a core building block for financial and quantitative reporting.

Question 87

How can an analyst check the exact schema definition of a table in Databricks SQL?

1. By running DESCRIBE TABLE table_name
2. By deleting the table and recreating it
3. By checking local browser cache
4. By restarting the cluster

Correct Answer: 1

Explanation

The DESCRIBE TABLE command outputs the schema structure of a specified table, listing every column name, its corresponding data type, and whether null values are permitted.

Question 88

What does the TRIM() function do in Databricks SQL?

1. It removes leading and trailing whitespace characters from a string.
2. It deletes rows from a table.
3. It shortens table names automatically.
4. It rounds decimal numbers.

Correct Answer: 1

Explanation

The TRIM() function cleans text data by stripping out extraneous leading and trailing spaces, which is essential for standardizing string columns during data cleansing.

Question 89

Which join type returns all records when there is a match in either left or right table records?

1. Full Outer Join
2. Inner Join
3. Left Join
4. Cross Join

Correct Answer: 1

Explanation

A Full Outer Join combines results from both tables, returning matched rows and filling unmatched rows with NULL values on either side to ensure complete data visibility.

Question 90

What is the purpose of the GROUP BY clause?

1. To group rows sharing identical values into summary rows for aggregation
2. To sort rows in ascending order
3. To filter individual rows before processing
4. To delete duplicate tables

Correct Answer: 1

Explanation

The GROUP BY clause aggregates rows with identical values into summary groups, enabling functions like SUM(), AVG(), and COUNT() to compute metrics per category.

Question 91

Which system catalog manages security, governance, and permissions across Databricks workspaces?

1. Unity Catalog
2. Hive Metastore
3. Local File System
4. Cloud Object Storage

Correct Answer: 1

Explanation

Unity Catalog provides centralized access control, auditing, and fine-grained governance for data, views, and volumes across all workspaces in a Databricks account.

Question 92

What is the function of the DATE_ADD() SQL function?

1. To add a specified number of days to a given date
2. To combine two text strings
3. To multiply numeric columns
4. To calculate running totals

Correct Answer: 1

Explanation

DATE_ADD(start_date, num_days) adds a specified integer number of days to a start date, which is useful for calculating future deadlines or rolling date windows.

Question 93

Which operator is used to perform pattern matching with wildcard characters in SQL?

1. LIKE
2. IN
3. BETWEEN
4. IS

Correct Answer: 1

Explanation

The LIKE operator is used with wildcard characters (like % for multiple characters and _ for a single character) to filter text patterns (e.g., WHERE name LIKE ‘A%’).

Question 94

What does a SQL query return if an inner join finds no matching records between two tables?

1. An empty result set (zero rows)
2. All records from the left table
3. All records from both tables
4. A syntax error exception

Correct Answer: 1

Explanation

An INNER JOIN requires matching keys to exist in both tables; if no keys match, no rows meet the criteria, resulting in an empty output set.

Question 95

Which command is used to remove a table definition from the metastore permanently?

1. DROP TABLE
2. DELETE TABLE
3. REMOVE TABLE
4. CLEAR TABLE

Correct Answer: 1

Explanation

The DROP TABLE command deletes the table metadata from the catalog, and depending on whether the table is managed or external, it may also remove underlying data files.

Question 96

What is the purpose of the COALESCE function in queries with multiple fallback columns?

1. To return the first non-null value from the provided list of expressions
2. To multiply all column values together
3. To sort rows alphabetically
4. To delete null records from storage

Correct Answer: 1

Explanation

COALESCE(col1, col2, ‘default’) scans arguments sequentially and returns the first value that is not null, preventing null pointer errors during data consolidation.

Question 97

Which Databricks feature optimizes query performance by vectorizing execution on modern CPU hardware?

1. Photon Engine
2. Hive SerDe
3. CSV Parser
4. Spark Driver

Correct Answer: 1

Explanation

Photon is Databricks’ native vectorized C++ query engine that accelerates relational scans, joins, and aggregations significantly on SQL Warehouses.

Question 98

What does the BETWEEN operator evaluate in a WHERE clause?

1. Whether a value falls within a specified inclusive range
2. Whether a string contains specific wildcard letters
3. Whether a column value is completely null
4. Whether a table has active partitions

Correct Answer: 1

Explanation

The BETWEEN operator checks if a value is within a specified range (e.g., WHERE age BETWEEN 18 AND 30), inclusive of the boundary values.

Question 99

Why would an analyst use UNION instead of UNION ALL?

1. To combine query results while automatically removing duplicate rows
2. To execute queries faster without sorting
3. To multiply row counts into a Cartesian product
4. To join tables on a shared key column

Correct Answer: 1

Explanation

UNION removes duplicate rows from the combined result set, whereas UNION ALL retains all rows including duplicates. UNION requires extra sorting overhead to filter duplicates.

Question 100

What is the role of the Bronze layer in the medallion architecture?

1. Ingesting raw source data in its original format without modifications
2. Storing finalized executive dashboard charts
3. Performing complex machine learning model training
4. Deleting old log files from storage

Correct Answer: 1

Explanation

The Bronze layer serves as the initial landing zone for raw, unprocessed ingestion from source systems (APIs, event streams, databases), preserving data in its original format for auditing and downstream cleansing.