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Common data connectivity modes include DirectQuery, Import, Live Connection, and Composite models.
DirectQuery allows querying data directly from the data source in real-time.
Import mode imports data into Power BI for faster performance but may not reflect real-time data.
Live Connection connects Power BI to a data source without importing data.
Composite models combine DirectQuery and Import modes for flexibility.
Power BI components include Power Query, Power Pivot, Power View, and Power Map.
Power Query: Used for data extraction, transformation, and loading (ETL)
Power Pivot: Used for data modeling and analysis
Power View: Used for data visualization and interactive reports
Power Map: Used for geospatial data visualization
Power Query is used for data transformation and Power View is used for data visualization in Power BI.
Power Query is used to extract, transform, and load data from different sources.
Power View is used to create interactive visualizations and reports based on the transformed data.
Power Query is more focused on data preparation and cleaning, while Power View is focused on data visualization.
Power Query can be used to mer...
Relationship cardinality defines the number of instances of one entity that can be associated with the number of instances of another entity.
One-to-One: Each record in the first entity is associated with only one record in the second entity.
One-to-Many: Each record in the first entity can be associated with multiple records in the second entity.
Many-to-Many: Multiple records in the first entity can be associated with m
Having clause is used with aggregate functions while where clause is used to filter rows
Having clause is used with GROUP BY to filter groups based on conditions
Where clause is used to filter rows based on conditions
Having clause is applied after grouping while where clause is applied before grouping
Example: SELECT department, AVG(salary) FROM employees GROUP BY department HAVING AVG(salary) > 50000
Example: SELECT * FRO
Use SQL query with ORDER BY and LIMIT to find the 4th highest salary
Use ORDER BY clause to sort salaries in descending order
Use LIMIT 3,1 to skip the first 3 highest salaries and get the 4th highest salary
RLS stands for Row-Level Security, a feature in Power BI that restricts data access based on user roles.
RLS allows you to control which rows of data a user can access in a Power BI report or dashboard
You can define security roles and rules to filter data based on user attributes or roles
RLS helps in ensuring data privacy and compliance with regulations
For example, you can use RLS to restrict a sales manager to only see
Use SUMX function in DAX to calculate total sales of a product
Use SUMX function to iterate over each row in the sales table
Filter the table to include only the specific product
Sum up the sales amount for each row to get the total sales
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Scenario based with power BI UI creation
Power BI is a business intelligence tool used for data visualization and analysis.
Power BI allows users to connect to various data sources such as databases, Excel files, and online services.
Users can create interactive reports and dashboards using Power BI's drag-and-drop interface.
Power BI offers a wide range of visualization options like charts, graphs, and maps to present data effectively.
Users can share their repo...
Power BI reports are visual representations of data insights, created using Power BI Desktop or Power BI Service.
Power BI reports are interactive and customizable
They can include various visualizations like charts, graphs, tables, and maps
Reports can be shared and accessed online through Power BI Service
Data can be refreshed in real-time or scheduled updates
posted on 22 Oct 2024
posted on 8 Apr 2022
Remove duplicate objects from an array of multiple objects.
Create a new array to store unique objects
Loop through the original array and check if the object already exists in the new array
If not, add it to the new array
Return the new array
Maintain state by using a global variable or a state management system.
Use a global variable to store the state and access it whenever needed.
Use a state management system like Redux or MobX to manage the state.
Avoid using local variables or closures to store state as they will be lost when the code is repeated.
Consider using object-oriented programming principles to encapsulate state within objects.
Use functional prog...
Design patterns are reusable solutions to common software problems. Android system uses various design patterns.
MVC (Model-View-Controller) pattern is used in Android to separate UI logic from business logic.
Singleton pattern is used to ensure only one instance of a class is created.
Observer pattern is used to notify changes in data to multiple components.
Builder pattern is used to simplify complex object creation.
Adap...
posted on 5 Feb 2021
I applied via Recruitment Consulltant and was interviewed before Jul 2021. There were 3 interview rounds.
I applied via Campus Placement and was interviewed in Dec 2020. There were 5 interview rounds.
Program to print a pattern and implement bubble sort on an array of strings.
For pattern printing, use nested loops to print the desired pattern.
For bubble sort, compare adjacent elements and swap if necessary.
Use a loop to iterate through the array until no more swaps are needed.
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