Oracle Plsql Developer Interview Questions and Answers for Experienced

Q1. What was temp variable
Ans. 
A temporary variable used to store data during program execution.
• Temp variables are used to hold data temporarily during program execution.

• They are typically used in loops or conditional statements.

• Once the program execution is complete, the temp variable is no longer needed.

• Example: int temp = 0; for(int i=0; i<10; i++) { temp += i; }

• In this example, the temp variable is used to store the sum of the numbers 0-9.
Answered by AI
Add your answer
Q2. Breif about previous company
Add your answer

Q1. Document verification and onboarding
Add your answer

Q1. Technical question related about based on project and domain knowledge
Add your answer

Q1. Asked about flexibility and discussion with salary
Add your answer

Q1. Difference between delete,drop, truncate
Ans. 
Delete removes specific rows from a table, drop removes the entire table, truncate removes all rows from a table.
• Delete is a DML command used to remove specific rows from a table based on a condition.

• Drop is a DDL command used to remove an entire table along with its structure and data.

• Truncate is a DDL command used to remove all rows from a table but keeps the table structure intact.

• Delete can be rolled back, drop can...read more
Answered by AI
Add your answer

Q1. What is groupby
Ans. 
The GROUP BY clause in SQL is used to group rows that have the same values into summary rows.
• It is used with aggregate functions like COUNT, SUM, AVG, etc.

• It is used to group rows based on one or more columns in a table.

• It is often used in conjunction with the SELECT statement.
Answered by AI
Add your answer
Q2. What is having
Add your answer

Presence of mind was checked.

Queries related to joins and union were mainly asked.

Q1. Where do you see yourself after 5 years?
Add your answer

Q1. What is Groupby
Add your answer
Q2. What is cte?
Add your answer

Q1. Queries on joins using inner join, left join, right join, outer join
Add your answer
Q2. What are the definitions of case and decode, what are the differences between them, and can you explain the logic for each?
Ans. 
Case and decode are conditional expressions in PL/SQL used for data manipulation.
• CASE is used for conditional logic in SQL statements, while DECODE is used for conditional logic in SELECT statements.

• CASE is more flexible and can handle multiple conditions, while DECODE is limited to one condition.

• CASE can be used in both SQL and PL/SQL, while DECODE is specific to SQL.

• Example of CASE: SELECT CASE WHEN condition1 THEN r...read more
Answered by AI
Add your answer
Q3. What are the primary key and foreign key in database design, and can you provide examples of each?
Ans. 
Primary key uniquely identifies each record in a table, while foreign key establishes a link between two tables.
• Primary key ensures uniqueness and cannot have null values

• Foreign key establishes a relationship between tables based on the primary key of another table

• Example of primary key: EmployeeID in an Employee table

• Example of foreign key: DepartmentID in an Employee table linking to DepartmentID in a Department tabl
Answered by AI
Add your answer
Q4. What are the differences between Rank and Dense Rank in SQL?
Ans. 
Rank assigns unique ranks to each distinct row, while Dense Rank assigns consecutive ranks without gaps.
• Rank may have gaps in the ranking sequence, while Dense Rank does not.

• Rank assigns the same rank to rows with the same values, while Dense Rank assigns different ranks.

• Rank function is non-consecutive, while Dense Rank function is consecutive.
Answered by AI
Add your answer
Q5. What is the difference between procedures and functions?
Ans. 
Procedures are used to perform an action, while functions return a value.
• Procedures do not return a value, while functions do.

• Functions can be called from SQL queries, while procedures cannot.

• Functions must return a value, while procedures do not necessarily have to.
Answered by AI
Add your answer
Q6. Is it possible to use a package body without a package specification?
Ans. 
No, a package body cannot be used without a package specification.
• A package body must always be associated with a package specification.

• The package specification defines the public interface of the package, while the package body contains the implementation details.

• Attempting to use a package body without a corresponding package specification will result in compilation errors.
Answered by AI
Add your answer
Q7. What is a SQL query that can be used to find duplicate values in a database?
Ans. 
Use a SQL query with GROUP BY and HAVING clause to find duplicate values in a database.
• Use GROUP BY clause to group the values that are duplicated.

• Use HAVING clause to filter out the groups that have more than one occurrence.

• Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;
Answered by AI
Add your answer
Q8. Queries using group by and having clause
Ans. 
Group by and having clause are used together to filter groups based on specified conditions.
• Group by clause is used to group rows that have the same values into summary rows.

• Having clause is used to filter groups based on specified conditions.

• Example: SELECT department, AVG(salary) FROM employees GROUP BY department HAVING AVG(salary) > 5000;
Answered by AI
Add your answer
Q9. What are the definitions of the Substr and Instr functions?
Ans. 
Substr function extracts a substring from a string, while Instr function returns the position of a substring within a string.
• Substr function syntax: SUBSTR(string, start_position, length)

• Example: SUBSTR('Hello World', 7, 5) will return 'World'

• Instr function syntax: INSTR(string, substring)

• Example: INSTR('Hello World', 'World') will return 7
Answered by AI
Add your answer
Q10. What is the process for writing a SQL query that includes a subquery?
Ans. 
Writing a SQL query with a subquery involves nesting one query inside another to retrieve specific data.
• Start by writing the main query that will retrieve the primary data

• Identify the criteria for the subquery to filter the results

• Enclose the subquery within parentheses and use it in the WHERE or FROM clause of the main query

• Ensure that the subquery returns a single value or a single column result
Answered by AI
Add your answer
Q11. What is the difference between char, varchar, and varchar2 data types?
Ans. 
Char is fixed length, varchar is variable length with max 4000 bytes, varchar2 is variable length with max 32767 bytes.
• Char is fixed length and always right-padded with spaces, while varchar and varchar2 are variable length.

• Varchar can store up to 4000 bytes of data, while varchar2 can store up to 32767 bytes.

• Char is less efficient in terms of storage compared to varchar and varchar2.
Answered by AI
Add your answer
Q12. Queries using Trunc and round
Add your answer
Q13. Is it possible to combine two tables with differing data and columns without utilizing joins?
Ans. 
No, it is not possible to combine two tables with differing data and columns without utilizing joins.
• Joins are necessary to combine tables based on a common column or key.

• Different data and columns require a join to match and merge the data properly.

• Examples of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
Answered by AI
Add your answer
Q14. Is it possible to update data in a view?
Ans. 
Yes, it is possible to update data in a view using INSTEAD OF triggers.
• Views are virtual tables that display data from one or more tables.

• By using INSTEAD OF triggers, you can update data in a view by specifying the logic to handle the update operation.

• The trigger intercepts the update operation on the view and executes the specified logic to update the underlying tables.

• For example, you can create an INSTEAD OF trigge...read more
Answered by AI
Add your answer

Q1. Can you describe yourself and provide details about your project, including the brief questions that were asked about it?
Add your answer
Q2. Why TCS?
Ans. 
TCS is a global IT services company known for its innovative solutions and commitment to employee growth.
• TCS has a strong reputation in the IT industry for delivering high-quality services.

• TCS offers opportunities for professional growth and development through training programs and career advancement.

• TCS has a diverse and inclusive work culture that values teamwork and collaboration.
Answered by AI
Add your answer
Q3. What is a dynamic cursor in database management?
Ans. 
A dynamic cursor in database management allows for the execution of different SQL queries at runtime.
• Dynamic cursors are used when the SQL query to be executed is not known until runtime.

• They allow for flexibility in querying the database based on user input or other conditions.

• Dynamic cursors can be used to handle varying result sets or conditions in a more efficient manner.

• Example: Using a dynamic cursor to search fo...read more
Answered by AI
Add your answer
Q4. Did you perform performance tuning, and if so, what steps did you take?
Ans. 
Yes, I have performed performance tuning by identifying bottlenecks and optimizing queries.
• Identified slow queries using tools like SQL Trace, Explain Plan, and AWR reports.

• Optimized queries by adding indexes, rewriting SQL statements, and reducing unnecessary data retrieval.

• Tuned PL/SQL code by using bulk processing, minimizing context switches, and optimizing loops.

• Utilized database features like partitioning and mat
Answered by AI
Add your answer
Q5. What is the definition of a package, and is it possible to use a package body without a package specification?
Ans. 
A package in PL/SQL is a collection of related procedures, functions, variables, and other constructs.
• A package consists of two parts: package specification and package body.

• The package specification defines the public interface of the package, including declarations of variables, constants, cursors, procedures, and functions.

• The package body contains the actual implementation of the procedures and functions declared i...read more
Answered by AI
Add your answer
Q6. I got more questions from my project related
Add your answer

Q1. What are your reasons for wanting to join TCS?
Ans. 
I am excited about the opportunity to work with a global leader like TCS and contribute to innovative projects.
• TCS is a renowned global company with a strong reputation in the IT industry

• I am impressed by TCS's commitment to innovation and cutting-edge technology

• I believe TCS offers great opportunities for professional growth and development

• I am excited about the chance to work on diverse and challenging projects at TC
Answered by AI
Add your answer
Q2. What is your current salary package?
Ans. 
I prefer to discuss my salary expectations based on the responsibilities and requirements of the position.
• Focus on discussing salary expectations based on the job responsibilities and requirements.

• Avoid disclosing specific current salary package.

• Emphasize the importance of fair compensation based on market rates and skills.

• Provide examples of successful projects or achievements that demonstrate your value.

• Discuss oppor...read more
Answered by AI
Add your answer
Q3. What is your expected salary package?
Ans. 
I am looking for a competitive salary package based on my experience and skills.
• I am open to discussing salary based on the responsibilities and requirements of the role.

• I have researched the average salary range for Plsql Developers in this location.

• I am looking for a package that includes benefits such as healthcare, retirement plans, and professional development opportunities.
Answered by AI
Add your answer
Q4. Are you comfortable with shift work?
Ans. 
Yes, I am comfortable with shift work and have experience working various shifts.
• I have previous experience working different shifts in my current/previous roles.

• I am flexible with my schedule and can easily adapt to changing shift patterns.

• I understand the importance of shift work in ensuring 24/7 coverage for critical systems.
Answered by AI
Add your answer
Q5. Are you ok with any location
Ans. 
Yes, I am open to any location for the Plsql Developer position.
• I am willing to relocate for the right opportunity

• I am open to working in different cities or countries

• I am flexible with travel requirements for the job
Answered by AI
Add your answer
Q6. Holding any other offers in hand
Add your answer

Q1. What is performing tuning?
Ans. 
Performance tuning is the process of optimizing the performance of a system or application.
• Identifying and resolving performance bottlenecks

• Optimizing database queries and indexes

• Improving hardware and network configurations

• Reducing resource usage and improving response time

• Monitoring and analyzing system performance
Answered by AI
Add your answer

Q1. Explain stored procedure and PLSQL concept in detail?
Ans. 
Stored procedure is a precompiled program that is stored in a database and can be called by other programs.
• Stored procedures are used to encapsulate business logic and improve performance.

• PL/SQL is a procedural language used to write stored procedures in Oracle databases.

• Stored procedures can accept input parameters and return output parameters or result sets.

• They can also be used to enforce security and data integrity...read more
Answered by AI
Add your answer