WERTMARK TECHNOLOGIES Senior SQL Developer Interview Questions and Answers

Q1. Questions related to the current and past projects.
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Q2. Aws related questions.
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Q3. Data warehousing basics
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Q1. Explain about the roles and responsibilities.
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Q2. Discussion about the role in Genpact.
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Q1. Asked about expectated salary
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Q2. Why are you switching
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Q1. What is sql , index , stored proc , triggers
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Q1. Window function coding test
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Window function coding test involves using window functions in SQL to perform calculations within a specified window of rows.
• Understand the syntax and usage of window functions in SQL

• Use window functions like ROW_NUMBER(), RANK(), DENSE_RANK(), etc. to perform calculations

• Specify the window frame using PARTITION BY and ORDER BY clauses

• Practice writing queries with window functions to get comfortable with their usage
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Q2. Explain azure data factory
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Azure Data Factory is a cloud-based data integration service that allows you to create, schedule, and manage data pipelines.
• Azure Data Factory is used to move and transform data from various sources to destinations.

• It supports data integration processes like ETL (Extract, Transform, Load) and ELT (Extract, Load, Transform).

• You can create data pipelines using a visual interface in Azure Data Factory.

• It can connect to on...read more
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Q1. What is data vault
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Data Vault is a modeling methodology for designing highly scalable and flexible data warehouses.
• Data Vault focuses on long-term historical data storage

• It consists of three main components: Hubs, Links, and Satellites

• Hubs represent business entities, Links represent relationships between entities, and Satellites store attributes of entities

• Data Vault allows for easy scalability and adaptability to changing business requ
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Q2. What is lambda architecture
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Lambda architecture is a data processing architecture designed to handle massive quantities of data by using both batch and stream processing methods.
• Combines batch processing layer, speed layer, and serving layer

• Batch layer processes historical data in large batches

• Speed layer processes real-time data

• Serving layer merges results from batch and speed layers for querying

• Example: Apache Hadoop for batch processing, Apach
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Q1. Whether have onsite exposure
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Yes, I have onsite exposure in previous roles.
• I have worked onsite at various client locations to gather requirements and implement solutions.

• I have experience collaborating with cross-functional teams in person.

• I have conducted onsite training sessions for end users on data architecture best practices.

• I have participated in onsite data migration projects.

• I have worked onsite to troubleshoot and resolve data-related is
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Q1. Basic questions from Swift
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Q1. Basic data structure questions
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Q2. Explain binary search with example
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Binary search is a search algorithm that finds the position of a target value within a sorted array.
• Divide the array into two halves and compare the target value with the middle element.

• If the target value is less than the middle element, search the left half. If greater, search the right half.

• Repeat the process until the target value is found or the subarray is empty.
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Q1. What is concurrency technique in android
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Concurrency technique in Android allows multiple tasks to run simultaneously, improving performance and responsiveness.
• Concurrency in Android can be achieved using AsyncTask, Handlers, Executors, and RxJava.

• AsyncTask allows running background tasks on a separate thread and updating UI on the main thread.

• Handlers are used to post and process Runnable objects on a thread's message queue.

• Executors provide a high-level API...read more
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Q1. Explain about previous project and what was your role in that project
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All the basic questions of SQL like joins, index, different between in where and having etc

Q1. Salary discussion
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Q1. Diff b/w diff and guard
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diff is used to compare two collections and return the differences, while guard is used for early exit in a function if a condition is not met.
• diff is a method used in Swift to compare two collections and return the differences.

• guard is a keyword used in Swift to provide an early exit from a function if a condition is not met.

• Example: let array1 = [1, 2, 3, 4], array2 = [3, 4, 5, 6]; let result = array1.diff(array2) //...read more
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Q2. What is GCD and Multitreadung
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GCD stands for Grand Central Dispatch, a technology used in iOS for managing concurrent operations. Multithreading is the ability of a CPU to execute multiple threads concurrently.
• GCD is used for managing tasks asynchronously and efficiently utilizing system resources.

• Multithreading allows multiple tasks to run concurrently, improving performance and responsiveness of an application.

• Example: Using GCD to download image...read more
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Q1. About sql and roles and responsibilities
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Q2. What is sql ? What are joins ?
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SQL is a programming language used to manage and manipulate relational databases. Joins are used to combine data from multiple tables.
• SQL stands for Structured Query Language

• It is used to create, modify, and query databases

• Joins are used to combine data from two or more tables based on a related column

• Types of joins include inner join, left join, right join, and full outer join

• Example: SELECT * FROM table1 INNER JOIN t
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Q3. What are set operators ?
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Set operators are used to combine the result sets of two or more SELECT statements.
• Set operators include UNION, UNION ALL, INTERSECT, and EXCEPT.

• UNION combines the results of two SELECT statements and removes duplicates.

• UNION ALL combines the results of two SELECT statements and includes duplicates.

• INTERSECT returns only the common rows between two SELECT statements.

• EXCEPT returns only the rows from the first SELECT st...read more
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Q4. What are constraints?
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Constraints are rules that are applied to a table column or a group of columns.
• Constraints ensure data accuracy and consistency in a database.

• They can be used to enforce rules like uniqueness, primary key, foreign key, etc.

• Constraints can be added when creating a table or altered later using ALTER TABLE statement.

• Examples of constraints include NOT NULL, CHECK, UNIQUE, PRIMARY KEY, FOREIGN KEY, etc.
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