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Databricks Databricks-Certified-Data-Engineer-Associate Exam Syllabus Topics:

SectionObjectives
Databricks Lakehouse Platform Fundamentals- Clusters, notebooks, and basic Databricks environment usage
- Workspace, architecture, and core platform concepts
Data Ingestion and ELT Development- Data ingestion using Spark SQL and PySpark
- Handling structured and semi-structured data
- ETL patterns and transformations
Data Processing and Transformations- Delta Lake fundamentals (tables, transactions, optimization)
- User-defined functions (UDFs)
- Apache Spark SQL operations (joins, aggregations, filtering)
- PySpark DataFrame transformations
Productionizing Data Pipelines- Scheduling and monitoring jobs
- Pipeline deployment and operationalization
- Databricks Workflows / Jobs orchestration
Data Governance and Quality- Data quality concepts and management
- Data access control and governance
- Unity Catalog basics

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Databricks Certified Data Engineer Associate Exam Sample Questions (Q153-Q158):

NEW QUESTION # 153
Which of the following commands can be used to write data into a Delta table while avoiding the writing of duplicate records?

Answer: D

Explanation:
The MERGE command can be used to upsert data from a source table, view, or DataFrame into a target Delta table. It allows you to specify conditions for matching and updating existing records, and inserting new records when no match is found. This way, you can avoid writing duplicate records into a Delta table1. The other commands (DROP, IGNORE, APPEND, INSERT) do not have this functionality and may result in duplicate records or data loss234. References: 1: Upsert into a Delta Lake table using merge | Databricks on AWS 2: SQL DELETE | Databricks on AWS 3: SQL INSERT INTO | Databricks on AWS 4: SQL UPDATE | Databricks on AWS


NEW QUESTION # 154
A data engineer needs to apply custom logic to string column city in table stores for a specific use case. In order to apply this custom logic at scale, the data engineer wants to create a SQL user-defined function (UDF).
Which of the following code blocks creates this SQL UDF?

Answer: D

Explanation:
Explanation
https://www.databricks.com/blog/2021/10/20/introducing-sql-user-defined-functions.html


NEW QUESTION # 155
Which of the following Structured Streaming queries is performing a hop from a Silver table to a Gold table?

Answer: C

Explanation:
The best practice is to use "Complete" as output mode instead of "append" when working with aggregated tables. Since gold layer is work final aggregated tables, the only option with output mode as complete is option E.


NEW QUESTION # 156
A data architect has determined that a table of the following format is necessary:

Which of the following code blocks uses SQL DDL commands to create an empty Delta table in the above format regardless of whether a table already exists with this name?

Answer: E


NEW QUESTION # 157
A data engineer needs to find all customers who have never placed an order. The customers table contains customer_id, customer_name, and other customer attributes. The orders table contains order_id, customer_id, and other order attributes. Both tables share customer_id as the join key. The result must include only customer columns with no order-related columns in the output. Which expression exactly achieves this requirement?

Answer: A

Explanation:
A left anti-join returns only rows from customers that have no matching customer_id in orders, and it outputs only columns from the left-side customers table.


NEW QUESTION # 158
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