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Interview Questions and Answers for 'Ab' - 367 question(s) found - Order By Rating

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 Q1. Why do we do transformation on the observable itself rather than doing it in the subscriber ? RxJs
Ans. Because that way we just need to do that transformation at one place and not within each subscriber. Single source of truth.

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   Like         Discuss         Correct / Improve     Angular   Observable  Suscriber


 Q2. What does pipe does on an observable ?RxJs
Ans. With pipe we specify the operator function to which this observable is passed for transforming the observable.

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   Like         Discuss         Correct / Improve     Angular   Observable


 Q3. What is the difference between Subject and Observable ?Angular
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     subject vs observable


 Q4. What is the main difference between unique key and primary key ?Database
Ans. Primary key will not accept NULL values whereas Unique key can accept one NULL value.

A table can have only primary key whereas there can be multiple unique key on a table.

A Clustered index automatically created when a primary key is defined whereas Unique key generates the non-clustered index.

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   Like         Discuss         Correct / Improve     Unique Key  Primary Key     Asked in 1 Companies


 Q5. Interface vs AbstractionCore Java
 This question was recently asked at 'Oracle financial services'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     interface vs abstraction  interfacing vs abstraction  relation between interface and abstraction  How interface provide abstraction     Asked in 1 Companies


 Q6. Difference between XSS and CSRF ?Security
Ans. SRF attack requires an authenticated session, whereas an XSS attack doesn’t.
XSS doesn’t require any user interaction.CSRF is restricted to the actions the victim can perform.
XSS requires a vulnerability to happen, whereas CSRF relies on tricking the user to click a link or access a page.
CSRF can only send an HTTP request but cannot view the response. XSS can send and receive HTTP requests and responses to extract the required data.

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   Like         Discuss         Correct / Improve     xss attack  csrf attack  security vulnerabilities  security attack  web security     Asked in 3 Companies


 Q7. Can the value of a static variable be changed ? Core Java
Ans. Yes the value of a static variable can be changed. It's the final keyword that restrict the modification of value not static.


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   Like         Discuss         Correct / Improve     static variables


 Q8. How would you design the database schema for an event?Database
Ans. Broad question, but if the company need velocity, think about use a NO SQL instead of regular SQL databases.

Also prefers materialized views instead of joins to fetch data quickly.

Regarding the database design, there are very good design tools for professional database (to develop proper indexes and good database design) one of the best is QuickDBD

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   Like         Discuss         Correct / Improve     database design  database schema     Asked in 1 Companies


 Q9. Why would a cloud customer use resources in multiple regions and zones ?Cloud Computing
Ans. 1. Fault Tolerance
2. Better Access by bringing the application closer to the users.

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   Like         Discuss         Correct / Improve     Google Cloud Computing (GCP)  Amazon Web Services (AWS)  Availability Zones  Regions and Zones  Infrastructure


 Q10. differences between drop , delete and truncateDatabase
 This question was recently asked at 'HCL Technologies'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q11. What is Throwable ?Core Java
Ans. Throwable in java is a class that is the superclass of all exceptions and errors which may occurs in java program.It extends obcect class.

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   Like         Discuss         Correct / Improve     exception handling   throwable     Asked in 1 Companies      basic


 Q12. What is a composite primary key and foreign key ?Database
 This question was recently asked at 'jibe development services'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q13. What is SNMP ?Networking
Ans. SNMP or Simple Network Management protocol is an application layer protocol for exchanging management information between network devices.


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   Like         Discuss         Correct / Improve          Asked in 15 Companies


 Q14. What can be done to protect the application from DDOS attack ?Security
Ans. We can set the max number of requests from a given IP or an IP range

We can set the time out so that a single request cannot hold on to resources for too long.

We can identify patterns ( like too many requests from single IP for single page ) and then block such requests.

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   Like         Discuss         Correct / Improve     DDOS  security vulnerability


 Q15. Find the second largest array element without sorting?Design
Ans. We initialize two variables first and second to INT_MIN as,
first = second = INT_MIN
then Start traversing the array,
If the current element in array say arr[i] is greater
than first. Then update first and second as,
second = first
first = arr[i]
If the current element is in between first and second,
then update second to store the value of current variable as
second = arr[i]
then Return the value stored in second.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q16. How can we increase the speed of SQL queries ?Database
Ans. Using -
1. Prepared Statements
2. Using Indices
3. Using whereby clause only on indexed columns

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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q17. Explain Working of joins in sql.Database
 This question was recently asked at 'InfoGain'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q18. SQL Questions.Database
 This question was recently asked at 'Eurofins IT Solutions'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q19. Write SQL query to join 2 tables ?SQL
Ans. Select * from table1 join Select * from table2

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   Like         Discuss         Correct / Improve     database     Asked in 1 Companies


 Q20. What are different awt constructs ?
 This question was recently asked at 'Sabre Corporation'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q21. Differences between MongoDB and mysql.Database
 This question was recently asked at 'RiseSmart'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q22. Create DB schema for Employee, Department.Database
 This question was recently asked at 'RiseSmart India,RiseSmart'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     db schema  database schema  database design     Asked in 2 Companies


 Q23. Sort an Employee Object based on Name or AgeDatabase
Ans. Use Comparable or Comparator interface

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   Like         Discuss         Correct / Improve     sql query     Asked in 1 Companies


 Q24. Can we load environment variables into Properties in Java ? How ?Core Java
Ans. Yes

new Properties().putAll(System.getenv());

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   Like         Discuss         Correct / Improve     java.util.properties  environment variables


 Q25. Difference between System.getEnv and System.getProperties ?Core Java
Ans. System.getEnv gets the environment variables where System.getProperties gets Java properties.

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   Like         Discuss         Correct / Improve     System.getEnv  System.getProperties  environment variables


 Q26. Does abstract class have public constructor? Core Java
Ans. Yes, an abstract class can have a constructor in Java.

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   Like         Discuss         Correct / Improve     abstract class  public constructor     Asked in 1 Companies


 Q27. What is the minimum number of tables required to perform a SQL join?Database
Ans. 1 , We can do self join


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   Like         Discuss         Correct / Improve     sql join     Asked in 1 Companies


 Q28. Can we load Yaml files into AWS DynamoDB ?Amazon Web Services (AWS)
Ans. No

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   Like         Discuss         Correct / Improve     aws dynamodb  aws nosql database  amazon cloud nosql database


 Q29. Difference between composite , primary and unique key ?Database
 This question was recently asked at 'Thomson reuters'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q30. create an SQL query across multiple tables involving outer joins Database
Ans. Select * from table1 t1Left outer join table2 t2 on t1.tid = t2.id

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   Like         Discuss         Correct / Improve     sql query  database  outer joins     Asked in 2 Companies


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