Parexel International Interview Questions, Process, and Tips

Q1. Is sql necessary for your project ?
Ans. 
SQL is necessary for most projects involving databases to manage and query data efficiently.
• SQL is essential for creating, updating, and querying databases in most projects.

• Without SQL, it would be challenging to interact with databases and retrieve specific data.

• Examples of SQL commands include SELECT, INSERT, UPDATE, and DELETE.

• SQL can help optimize database performance and ensure data integrity.
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Q2. What is Hql ?
Ans. 
HQL stands for Hibernate Query Language, a query language similar to SQL but used for Hibernate ORM framework.
• HQL is used to perform database operations in Hibernate ORM framework.

• It is similar to SQL but operates on Hibernate objects instead of database tables.

• HQL queries are written in Hibernate-specific syntax.

• Example: 'FROM Employee e WHERE e.department = :dept'

• HQL queries are translated into SQL queries by Hiberna
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Q3. What are views ?
Ans. 
Views in Java are user interface components that display data from a model in a specific format.
• Views are used to represent the user interface in Java applications.

• They display data from a model in a visually appealing format.

• Examples include buttons, text fields, labels, and checkboxes.
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Q4. What are cross joins ?
Ans. 
Cross joins are a type of join operation in SQL that combines each row from one table with each row from another table.
• Cross joins do not have a join condition specified, resulting in a Cartesian product of the two tables.

• They can be used when you want to combine every row from one table with every row from another table.

• Cross joins can lead to a large result set if the tables being joined have many rows.
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Q5. Difference between delete and truncate
Ans. 
Delete removes rows one by one, while truncate removes all rows at once.
• Delete is a DML command, while truncate is a DDL command.

• Delete can be rolled back, while truncate cannot be rolled back.

• Delete fires triggers, while truncate does not fire triggers.

• Delete is slower as it logs individual row deletions, while truncate is faster as it logs the deallocation of the data pages.
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Normal mathematics, biology, and English.

Q1. What are the technical definitions related to pharmacovigilance?
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Q1. What is Hypertension?
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Q2. What is difference between Diabetes Insipidus and Diabetes Mellitus?
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Q3. What are Antimicrobial agents?
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Q4. What is difference between Rheumatoid arthritis and gout?
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Q5. What is difference between enzyme and hormone?
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Q6. What are neurotransmitters? Give example.
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Q7. What is Alzheimer's disease?
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Q8. What are allergens?
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Q9. What are Vaccines?
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Q1. Anagram of two strings in java
Ans. 
Java program to check if two strings are anagrams
• Create a function that takes two strings as input

• Convert both strings to character arrays and sort them

• Check if the sorted arrays are equal to determine if they are anagrams
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Q2. Insert and select query in MySQL
Ans. 
Insert and select data in MySQL using SQL queries
• Use INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...); to insert data

• Use SELECT * FROM table_name; to select all data from a table

• Use SELECT column1, column2 FROM table_name WHERE condition; to select specific data based on a condition
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Q3. Get and Post APIs in rest
Ans. 
GET and POST are HTTP methods used in REST APIs for retrieving and sending data.
• GET method is used to retrieve data from a server

• POST method is used to send data to a server

• GET requests are idempotent, while POST requests are not

• GET requests should only be used for retrieving data, not for modifying data

• Example: GET request to retrieve a list of users - GET /users

• Example: POST request to create a new user - POST /users
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