Free Practice Questions for Talend Talend-Core-Developer Exam

Comprehensive and Detailed Explanation:

To enhance the Trust Score™ of a dataset:

Improve the quality of the dataset using Pipeline Designer (Option A):

Utilizing Talend's Pipeline Designer allows you to cleanse, transform, and enrich your data, thereby improving its quality and, consequently, its Trust Score™.​

Add ratings to the dataset (Option D):

Encouraging users to rate the dataset increases its popularity metric, positively impacting the overall Trust Score™.​

Why not other options?

Option B: The Trust Score™ is automatically calculated based on specific metrics; it cannot be manually altered.​

Option C: While using the dataset in ETL jobs indicates its utility, it does not directly influence the Trust Score™ unless it affects metrics like usage or popularity.​

Comprehensive and Detailed Explanation:

The tMysqlOutput component in Talend provides several actions on tables to manage data output operations effectively. The supported actions include:​

Drop Table if Exists and Create (Option B):

This action checks if the specified table exists in the database. If it does, the table is dropped and a new one is created. This ensures that the table is recreated fresh for the data load.​

Create Table if Does Not Exist (Option D):

This action checks if the specified table exists in the database. If it does not exist, the table is created. If it already exists, no action is taken, and the existing table is used.​

Create Table (Option E):

This action attempts to create the specified table in the database. If the table already exists, an error will occur unless handled appropriately.​

These actions provide flexibility in managing database tables during data integration processes, allowing for dynamic table creation and management based on the Job's requirements.​

Comprehensive and Detailed Explanation:

ThetRESTRequest componentsupportsOpenAPI Specification (OAS)/Swagger 2.0for initializing component endpoints, API mappings, and documentation.

OAS/Swagger 2.0 file (Correct Answer - Option D):

tRESTRequest allows API-first development by importing aSwagger 2.0 (OAS) definition.

This enables automatic configuration of API endpoints, request parameters, and response structures.

Why not other options?

CSV definition file (Option A):Not a valid API definition format.

XML definition file (Option B):XML files are not standard for REST API definitions.

WSDL file (Option C):WSDL is used for SOAP-based web services, not REST.

Comprehensive and Detailed Explanation:

To filter customer records based onfirst name containing "Tom"andage greater than 18, theFilterprocessor is the correct choice.

Filter (Option C) – Correct Answer:

TheFilter processorallows users to setconditional rulesto extract only the required data.

Users can specify conditions such as:

first_name CONTAINS "Tom"

AND

age > 18

This ensures that only relevant records are included in the output.

Why not other options?

Option A (Join):Used to combine data from multiple datasets based on a key field, not for filtering.

Option B (Aggregate):Used for summarizing data, such as calculating counts, sums, or averages.

Option D (Data Sampling):Used to select a random subset of data, not for filtering based on conditions.

Comprehensive and Detailed Explanation:

To filter records based on a specific country dynamically, the best approach isusing a tDBInput component with a context variable in the SQL query (Option A).

Step-by-Step Process:

Define a Context Variable:

In theContext Variablessection of Talend Studio, create a new variable (context.country) and set its value dynamically.

Configure tDBInput:

Drag and drop the tDBInput component onto theDesigner.

Set up thedatabase connectionusing either Built-in or Repository mode.

In theQuery field, write:

SELECT id, name, address, country FROM customers WHERE country = '" + context.country + "'

Execute the Job:

The Job will retrieveonly those records where the country column matches the value of the context variable.

The value of context.country can be modified at runtime, making the querydynamic.

Why not other options?

tMatchGroup (Option B):Used for record deduplication, not filtering.

Run if Trigger (Option C):Controls execution flow but does not filter records inside tDBInput.

tFilterColumns (Option D):Removes unwanted columns but does not filter records based on conditions.

Comprehensive and Detailed Explanation:

In Talend Cloud Data Inventory, when a user creates a dataset using a shared connection, the following applies:​

User B has full access to Dataset_1 (Option D):

Once User B creates Dataset_1 using the shared connection, they become the owner of that dataset. Even if User A later revokes access to the connection, User B retains full access to Dataset_1. The dataset's accessibility is independent of the connection's sharing status after its creation.​

Why not other options?

Option A:User B's access to Dataset_1 is not limited; they have full ownership and control.​

Option B:Revoking the connection does not remove User B's access to datasets they have already created.​

Option C:User A's access to Dataset_1 depends on the sharing settings applied by User B; by default, User A does not have access unless granted.​