Celebal Technologies Power BI Developer Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DBMS.

Q1. What is data integrity?
Ans. 
Data integrity refers to the accuracy, consistency, and reliability of data throughout its lifecycle.
• Data integrity ensures that data is accurate and consistent in storage and transmission.

• It involves maintaining the quality and reliability of data over time.

• Methods for ensuring data integrity include checksums, encryption, and error detection codes.

• Examples of data integrity violations include data corruption, unautho
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Q2. What is a trigger in the context of a database management system?
Ans. 
A trigger is a special type of stored procedure that automatically executes when certain events occur in a database.
• Triggers are used to enforce business rules, maintain data integrity, and automate repetitive tasks.

• They can be triggered by INSERT, UPDATE, or DELETE operations on a table.

• Examples of triggers include auditing changes to a table, updating related tables when a record is modified, or enforcing referential
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Q3. What is the difference between clustered and non-clustered indexes in a database management system?
Ans. 
Clustered indexes physically order the data in the table, while non-clustered indexes do not.
• Clustered indexes determine the physical order of data in the table, while non-clustered indexes do not.

• A table can have only one clustered index, but multiple non-clustered indexes.

• Clustered indexes are faster for retrieval of data, especially range queries, compared to non-clustered indexes.

• Non-clustered indexes are stored se...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions on DBMS.

Q1. What is the difference between UNION and UNION ALL in SQL?
Ans. 
UNION combines and removes duplicates, UNION ALL combines without removing duplicates.
• UNION merges the result sets of two or more SELECT statements and removes duplicates.

• UNION ALL merges the result sets of two or more SELECT statements without removing duplicates.

• UNION is slower than UNION ALL as it involves removing duplicates.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column...read more
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Q2. What are the functions of a cursor in PL/SQL?
Ans. 
A cursor in PL/SQL is used to retrieve and process multiple rows of data one at a time.
• Allows iteration over a result set

• Retrieves data row by row

• Can be used to update or delete rows in a table

• Must be declared, opened, fetched, and closed
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Q3. Write a SQL query to fetch the nth highest salary from a table.
Ans. 
SQL query to fetch the nth highest salary from a table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to fetch the nth highest salary
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Round duration - 30 minutes
Round difficulty - Easy

This was a managerial round with typical behavioral problems.

First Round was Aptitute Test having Aptitute Question And Java Questions.

Second round was coding round having two DSA problems

Q1. 1. Difference between .equals() and == function. 2. Fibonacci series 3. MultiThreading
Ans. 
Questions on Java basics - .equals() vs ==, Fibonacci series, and MultiThreading.
• The .equals() function compares the values of two objects, while == compares their memory addresses.

• Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.

• MultiThreading is a technique where multiple threads of execution run concurrently within a single program.

• Examples: 5 == 5 is true, but new Str...read more
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Q1. 1. Javascript code to find the frequency of characters in a sentence. 2. Difference between dynamic and static intialization.
Ans. 
Javascript code to find frequency of characters in a sentence and difference between dynamic and static initialization.
• To find frequency of characters in a sentence, create an object and iterate over each character in the sentence. Increment the count of each character in the object.

• Dynamic initialization refers to initializing a variable at runtime, while static initialization refers to initializing a variable at comp...read more
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Q1. Esay leave DSA questions
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Q1. Java, OOPS, Collection,HashMap working
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Q1. Manager Round, previous projects, role and responsibilities
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