AT&T Interview Questions, Process, and Tips

Q1. How to pull the large amount of data in spring data jpa
Ans. 
To pull large amount of data in Spring Data JPA, use pagination, lazy loading, and query optimization techniques.
• Use pagination to limit the amount of data retrieved in each query

• Implement lazy loading to fetch data only when needed

• Optimize queries by using indexes, avoiding N+1 query problem, and fetching only necessary columns
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Q2. Write singleton class
Ans. 
Singleton class ensures only one instance of a class is created and provides a global point of access to it.
• Create a private static instance of the class

• Provide a private constructor to prevent instantiation

• Create a public static method to access the instance
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Q1. Routing LAN WAN
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Q2. Switching Wireless
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Q1. Previous Company
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Q2. Last salary and notice period
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It's was with basic questions about marketing

Q1. In depth details about social media marketing
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Q1. When would you like to join
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General topics - OTT vs Theatre

Q1. What is hypothesis Testing? What is p- value? Any Machine Learning algorithm - explanation. Basics of python , Statistics, Machine learning.
Ans. 
Hypothesis testing is a statistical method to make inferences about a population based on sample data.
• Hypothesis testing involves formulating a null hypothesis and an alternative hypothesis.

• The p-value is the probability of obtaining a test statistic as extreme as the one observed, assuming the null hypothesis is true.

• Machine learning algorithms are computational models that learn patterns and make predictions from dat...read more
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Q1. Basic HR questions- Relocation, Shifts, Salary
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