10+ Nous Infosystems Interview Questions and Answers

To improve SQL query performance, optimize indexes, use proper data types, and avoid using SELECT *.

• Optimize indexes by creating indexes on columns used in WHERE, JOIN, and ORDER BY clauses.

• Use proper data types to reduce storage space and improve query execution time.

• Avoid using SELECT * and instead specify only the necessary columns to reduce data retrieval time.

• Use stored procedures and parameterized queries to reduce network traffic and improve security.

• Avoid using subque...read more

The default value of int is 0.

• int is a value type in C#

• If a variable of type int is not initialized, it will have a default value of 0

• This default value is assigned by the compiler

Action methods are methods in ASP.NET MVC that handle HTTP requests and return responses.

• Action methods are defined in controllers.

• They can be public or non-public.

• They can return different types of results such as ViewResult, JsonResult, and PartialViewResult.

• They can have parameters that are bound from the request data.

• They can have attributes that specify HTTP verbs, caching, authentication, and authorization.

• Examples of action methods are Index(), Create(), Edit(), and De...read more

A class is a blueprint or template for creating objects, while an object is an instance of a class.

• A class defines the properties and methods that an object will have.

• An object is created from a class using the 'new' keyword.

• Multiple objects can be created from a single class.

• Classes can inherit properties and methods from other classes.

• Objects can have unique values for their properties, while classes define the structure of those properties.

DAX stands for Data Analysis Expressions and is a formula language used in Power BI, Excel, and Analysis Services.

• DAX is used to create custom calculations, measures, and columns in Power BI and Excel.

• It allows for complex calculations and aggregations on data.

• DAX functions can be used to manipulate data and perform calculations like SUM, AVERAGE, and CALCULATE.

• DAX is optimized for querying large datasets and can improve performance compared to traditional Excel formulas.

Inheritance is a mechanism in OOP where a new class is derived from an existing class.

• Inheritance allows for code reuse and promotes code organization.

• The derived class inherits all the properties and methods of the base class.

• The derived class can also override or extend the functionality of the base class.

• There are different types of inheritance such as single, multiple, and hierarchical inheritance.

• Example: A Car class can be derived from a Vehicle class, inheriting its pr...read more

Sum is a function used to calculate the total of a set of values, while sum x is a specific value being summed.

• Sum calculates the total of a set of values, while sum x is a specific value being summed.

• Sum is used with a range of values, like sum(A1:A10), while sum x is used with a single value, like sum x = 10.

• Sum x is often used in mathematical equations to represent a specific value being summed.

Power Query is used for data transformation and loading, while DAX is a formula language for creating calculated columns and measures in Power BI.

• Power Query is used for data transformation and loading from various sources.

• DAX is a formula language used for creating calculated columns and measures in Power BI.

• Power Query is more focused on data preparation and shaping, while DAX is used for calculations and analysis.

• Power Query is a visual tool for ETL processes, while DAX is...read more

Power BI offers powerful data visualization capabilities but may have limitations in handling large datasets.

• Advantages: user-friendly interface, wide range of data connectors, interactive dashboards

• Disadvantages: limitations in handling large datasets, requires a good understanding of data modeling

• Example: Power BI allows users to easily create interactive reports and dashboards by connecting to various data sources such as Excel, SQL databases, and cloud services.