Top 30 Most Common sql plsql interview questions You Should Prepare For
Landing a job that requires SQL and PL/SQL expertise means acing the interview. Preparing for sql plsql interview questions is crucial for showcasing your skills and knowledge. Master the common questions, and you'll boost your confidence, clarify your answers, and ace the interview. The key is to understand not just what the answer is, but why the interviewer is asking it.
What are sql plsql interview questions?
sql plsql interview questions are designed to assess your understanding of SQL (Structured Query Language), used for managing and manipulating databases, and PL/SQL (Procedural Language/SQL), Oracle's extension of SQL that adds procedural programming capabilities. These questions can cover a broad range of topics, from basic syntax and data types to advanced concepts like triggers, stored procedures, and performance optimization. The purpose of these sql plsql interview questions is to determine if you possess the practical knowledge and problem-solving skills necessary to work effectively with Oracle databases.
Why do interviewers ask sql plsql interview questions?
Interviewers ask sql plsql interview questions to evaluate a candidate's ability to design, develop, and maintain database solutions using SQL and PL/SQL. They want to see if you can apply your theoretical knowledge to real-world scenarios. By asking specific questions about triggers, cursors, or exception handling, interviewers can gauge your depth of understanding and practical experience. Furthermore, these sql plsql interview questions help assess your problem-solving skills and your ability to write efficient and maintainable code. The goal is to find candidates who not only know the syntax but can also use SQL and PL/SQL effectively to solve complex business problems. "The key is not to prioritize what's on your schedule, but to schedule your priorities." - Stephen Covey
Here is a preview of the 30 sql plsql interview questions we will cover:
What is PL/SQL?
What are the basic data types in PL/SQL?
What is the purpose of the WHEN clause in a trigger?
How do you optimize PL/SQL code?
What is a cursor in PL/SQL?
What is a stored procedure in PL/SQL?
What is the difference between a procedure and a function?
What is an anonymous block in PL/SQL?
How do you handle errors in PL/SQL?
What are the different types of triggers in PL/SQL?
What is a trigger in PL/SQL?
What is a package in PL/SQL?
What is the difference between a standard cursor and a FOR loop cursor?
How do you implement a FOR loop in PL/SQL?
What is a RECORD type in PL/SQL?
What is a REF CURSOR in PL/SQL?
What is a TABLE type in PL/SQL?
What is a dual table in Oracle?
What is a merge statement in PL/SQL?
What is the difference between the “verify” and the “feedback” command?
Explain the use of the %FOUND attribute in PL/SQL.
What is the purpose of the %NOTFOUND attribute?
How do you implement exception handling in PL/SQL?
What is a collection in PL/SQL?
What is an associative array in PL/SQL?
What is the difference between a function and a procedure in terms of compilation?
Explain parameter passing modes in PL/SQL.
What is a COMMIT statement?
What is a ROLLBACK statement?
How do you create an index in PL/SQL?
## 1. What is PL/SQL?
Why you might get asked this:
This is a fundamental question to gauge your basic understanding. Interviewers want to see if you know the core purpose of PL/SQL and how it extends SQL capabilities. This is a critical starting point for assessing your familiarity with sql plsql interview questions in general.
How to answer:
Start with a concise definition. Explain that PL/SQL is Oracle's procedural extension to SQL. Then, highlight its key features, such as the ability to embed procedural logic, use variables, loops, and handle exceptions.
Example answer:
PL/SQL is Oracle's procedural extension to SQL, letting developers embed procedural logic directly within SQL statements. In a project, I used PL/SQL to automate a complex data validation process. This included creating variables for storing intermediate results, using loops to iterate through data sets, and implementing exception handling to manage potential errors. This really improved the maintainability and readability of the whole project.
## 2. What are the basic data types in PL/SQL?
Why you might get asked this:
Understanding data types is essential for writing efficient and accurate PL/SQL code. This question tests your knowledge of the building blocks of PL/SQL programming. Mastering this aspect of sql plsql interview questions is crucial.
How to answer:
Categorize the data types into scalar, composite, and reference types. Provide examples of each, such as NUMBER, VARCHAR2, DATE for scalar types; RECORD and TABLE for composite types; and REF CURSOR for reference types.
Example answer:
PL/SQL includes several data types, the main categories being scalar, composite, and reference. For example, NUMBER, VARCHAR2, and DATE are scalar types. Then there are RECORD and TABLE for composite types. And finally, REF CURSOR represents the reference types. I've used each of these in different scenarios in my previous role. This knowledge is essential when writing queries and stored procedures.
## 3. What is the purpose of the WHEN clause in a trigger?
Why you might get asked this:
This question assesses your understanding of trigger functionality and conditional execution. It's about knowing when and how to use the WHEN clause to control trigger execution. This shows the interviewer you understand more advanced aspects of sql plsql interview questions.
How to answer:
Explain that the WHEN clause specifies a condition that must be true for the trigger to execute. Provide an example scenario where the WHEN clause is useful, such as only executing a trigger when a specific column is updated.
Example answer:
The WHEN clause in a trigger allows you to specify a condition that must be true for the trigger to actually fire. Consider a scenario where you only want a trigger to execute when the salary column of an employee is updated to a value greater than 100,000. Using the WHEN clause ensures that the trigger only runs under these circumstances, enhancing efficiency and reducing unnecessary processing. This helps me build solutions that scale properly.
## 4. How do you optimize PL/SQL code?
Why you might get asked this:
Performance is critical in database applications. This question tests your ability to write efficient PL/SQL code. This is a common component of sql plsql interview questions because it tests real-world skills.
How to answer:
Discuss various optimization techniques, such as using efficient data types, minimizing database calls, using FORALL statements for bulk processing, and using FOR loops instead of cursors when appropriate.
Example answer:
To optimize PL/SQL code, I focus on several key areas. I prioritize using efficient data types to minimize storage and processing overhead. Reducing database calls is also crucial, and I try to use FORALL statements for bulk processing. In one project, I converted a cursor-based operation to a FOR loop with bulk processing, which dramatically improved performance. This focus on efficiency makes a difference.
## 5. What is a cursor in PL/SQL?
Why you might get asked this:
Cursors are fundamental for iterating through result sets in PL/SQL. This question assesses your understanding of how cursors work and when to use them. Expect to face questions like this when interviewing for sql plsql interview questions positions.
How to answer:
Explain that a cursor is a pointer to a private SQL area that stores information about a SQL statement. It is used to retrieve data from a database in a controlled manner, row by row.
Example answer:
A cursor in PL/SQL is essentially a pointer to a private SQL area, which stores information about a SQL statement. Cursors allow you to retrieve data from a database in a controlled manner, one row at a time. In a recent reporting project, I used cursors to iterate through a large dataset, perform calculations on each row, and then insert the results into a summary table. This helped create custom reports based on complex logic.
## 6. What is a stored procedure in PL/SQL?
Why you might get asked this:
Stored procedures are essential for encapsulating reusable logic in the database. This question tests your understanding of their purpose and benefits. This is a popular topic among sql plsql interview questions.
How to answer:
Define a stored procedure as a collection of PL/SQL statements that can be executed as a single unit. Highlight the benefits, such as encapsulation of logic, improved database performance, and reusability.
Example answer:
A stored procedure in PL/SQL is a named block of PL/SQL code that encapsulates a specific task or set of operations. It's essentially a collection of PL/SQL statements executed as a single unit. I once designed a stored procedure to handle complex order processing logic, which greatly improved performance and reduced code duplication across different applications. This approach is critical for maintainable code.
## 7. What is the difference between a procedure and a function?
Why you might get asked this:
This question tests your understanding of the fundamental differences between procedures and functions and when to use each. It’s a classic question for sql plsql interview questions.
How to answer:
Explain that a procedure performs actions but does not necessarily return a value, while a function must return a value. Provide examples of when you would use each.
Example answer:
The key difference between a procedure and a function in PL/SQL is that a function must return a value, while a procedure does not necessarily have to. I typically use functions when I need to perform a calculation or transformation and return a single value. Procedures are more suitable for performing actions, like updating a table or sending an email, without needing to return a value. Understanding this distinction is fundamental for effective code design.
## 8. What is an anonymous block in PL/SQL?
Why you might get asked this:
This question assesses your understanding of PL/SQL block structure and the use of anonymous blocks for one-time execution. Interviewers might ask you sql plsql interview questions like these to gauge your ability to quickly test or execute snippets of PL/SQL code.
How to answer:
Define an anonymous block as a PL/SQL block that is executed once and does not have a name. Explain that they are often used for testing or running ad-hoc scripts.
Example answer:
An anonymous block in PL/SQL is a block of code that is executed once and isn't stored in the database with a specific name. I frequently use them for testing small pieces of PL/SQL code or running one-off scripts. For example, I might use an anonymous block to quickly verify a complex SQL query before incorporating it into a stored procedure. It is a handy tool for rapid development.
## 9. How do you handle errors in PL/SQL?
Why you might get asked this:
Error handling is crucial for robust applications. This question tests your ability to write code that can gracefully handle exceptions. This helps the interviewer see how you plan for real-world issues during the sql plsql interview questions.
How to answer:
Explain that errors are handled using EXCEPTION blocks. Describe how to define exceptions and handle them appropriately using TRY-CATCH (or BEGIN-EXCEPTION-END) blocks.
Example answer:
In PL/SQL, I handle errors using EXCEPTION blocks within my code. When an error occurs, control is transferred to the EXCEPTION block, where I can define specific exception handlers for different error conditions. In a recent data migration project, I used exception handling to catch and log any errors that occurred during the migration process, ensuring that no data was lost and providing detailed logs for debugging. This is essential for reliable systems.
## 10. What are the different types of triggers in PL/SQL?
Why you might get asked this:
This question assesses your understanding of the different types of triggers and when to use each type. Knowledge of triggers is very common when discussing sql plsql interview questions.
How to answer:
Explain that triggers can be classified as BEFORE or AFTER triggers, depending on when they are executed relative to the triggering event (e.g., INSERT, UPDATE, DELETE). Also mention row-level and statement-level triggers.
Example answer:
PL/SQL triggers can be broadly classified into BEFORE and AFTER triggers, depending on whether they fire before or after a specific database event. We also have statement-level and row-level triggers. In an auditing system, I used an AFTER trigger on the UPDATE statement to log changes to sensitive data, ensuring a complete audit trail of all modifications. The right trigger is essential for the job.
## 11. What is a trigger in PL/SQL?
Why you might get asked this:
This is a fundamental question to ensure you understand what triggers are and how they are used in PL/SQL. This is a frequently asked part of sql plsql interview questions.
How to answer:
Explain that a trigger is a PL/SQL program that is executed automatically when a specific event occurs in a database, such as an INSERT, UPDATE, or DELETE operation.
Example answer:
A trigger in PL/SQL is a special type of stored procedure that automatically executes in response to certain events on a particular table or view. In one project, I used a trigger to automatically update a 'last_modified' timestamp whenever a row in a specific table was updated. This ensured that we always had accurate information about when the data was last changed. It’s an automated and efficient way to maintain data integrity.
## 12. What is a package in PL/SQL?
Why you might get asked this:
This question assesses your understanding of how to organize and encapsulate PL/SQL code using packages. This can be a common part of sql plsql interview questions because it is a practical technique for building maintainable systems.
How to answer:
Define a package as a collection of related procedures, functions, variables, and types. Highlight the benefits, such as encapsulation, modularity, and improved code organization.
Example answer:
A package in PL/SQL is a schema object that groups logically related PL/SQL types, variables, constants, subprograms (procedures and functions), cursors, and exceptions. Packages provide modularity, making code easier to maintain and reuse. In a large project, I used packages to group all the data access routines for a specific module, which improved code organization and reduced naming conflicts. Packages are crucial for complex systems.
## 13. What is the difference between a standard cursor and a FOR loop cursor?
Why you might get asked this:
This question tests your understanding of different cursor types and their usage. A lot of sql plsql interview questions drill into the specifics of cursor usage because it is a common coding task.
How to answer:
Explain that a standard cursor requires explicit OPEN, FETCH, and CLOSE operations, while a FOR loop cursor is implicitly opened and closed. The FOR loop cursor is simpler and less verbose for basic iteration.
Example answer:
A standard cursor requires you to explicitly open, fetch data from, and then close the cursor. With a FOR loop cursor, the open, fetch, and close operations are handled implicitly by the loop. In a recent project, I opted for a FOR loop cursor when iterating through a result set for a simple report generation, as it reduced the amount of boilerplate code and improved readability. I use standard cursors for more complex logic.
## 14. How do you implement a FOR loop in PL/SQL?
Why you might get asked this:
This question assesses your ability to use loops for iterative processing in PL/SQL. This is an important element of answering sql plsql interview questions.
How to answer:
Explain that a FOR loop in PL/SQL is used to iterate over a collection or a cursor. Show how to declare the loop variable and specify the range or cursor to iterate over.
Example answer:
In PL/SQL, a FOR loop is used to iterate over a sequence of numbers or a collection. For instance, I used a FOR loop to process each element in an array of customer IDs. I'd use code to declare the loop counter and specify the range of values to iterate over. This enabled me to perform actions, like updating customer records. The code is clear and concise, as well as easier to maintain.
## 15. What is a RECORD type in PL/SQL?
Why you might get asked this:
This question tests your understanding of composite data types and how to define custom data structures. Interviewers want to assess your experience with using RECORD types when asking sql plsql interview questions.
How to answer:
Explain that a RECORD type is a composite data type that holds multiple fields, each of which can be of a different data type. It allows you to group related data together.
Example answer:
A RECORD type in PL/SQL is a composite data type that allows you to treat a collection of related data as a single unit. Imagine needing to represent an employee's information. You can define a RECORD type that includes fields like employee ID, name, and salary, which could all be of different data types. This helps simplify complex data handling.
## 16. What is a REF CURSOR in PL/SQL?
Why you might get asked this:
This question assesses your understanding of reference types and how to return result sets from stored procedures. Knowledge of REF CURSORs is often required when considering sql plsql interview questions.
How to answer:
Explain that a REF CURSOR is a pointer to a cursor. It is used to return a cursor from a procedure or function, allowing you to process the result set outside the procedure.
Example answer:
A REF CURSOR in PL/SQL is essentially a pointer to a cursor. It is used to pass a cursor as an argument to a stored procedure or return a cursor from a function, allowing you to process the result set outside of the procedure. For example, I used a REF CURSOR in a web application where the stored procedure fetched data and returned a cursor to the application layer for display. This helps separate data access logic from the application code.
## 17. What is a TABLE type in PL/SQL?
Why you might get asked this:
This question tests your understanding of collection types and how to work with arrays in PL/SQL. Some sql plsql interview questions will evaluate your knowledge of TABLE types.
How to answer:
Explain that a TABLE type is a composite data type that holds a collection of elements of the same data type. It is similar to an array and can be used to store multiple values in a single variable.
Example answer:
A TABLE type in PL/SQL is a collection type that holds an ordered set of elements, all of the same data type, similar to an array. I utilized a TABLE type to store a list of product IDs retrieved from a database query. This allowed me to easily iterate through the product IDs, performing additional operations. It streamlines the data handling process.
## 18. What is a dual table in Oracle?
Why you might get asked this:
This question tests your basic knowledge of Oracle database objects. The dual table is a key part of many sql plsql interview questions.
How to answer:
Explain that the dual table is a dummy table that contains one row and one column. It is often used to execute functions or expressions that do not depend on a specific table.
Example answer:
The DUAL table in Oracle is a small, one-row, one-column table present by default in all Oracle databases. It’s often used for selecting pseudo-columns or running functions that don't necessarily need to access a real table. I’ve used it to quickly test the SYSDATE function to retrieve the current date and time. It's great for testing things quickly without needing a real table.
## 19. What is a merge statement in PL/SQL?
Why you might get asked this:
This question assesses your knowledge of advanced SQL features and your ability to handle complex data manipulation tasks. Interviewers use sql plsql interview questions to explore how you've solved complex problems in the past.
How to answer:
Explain that a merge statement is used to update existing rows in a table or insert new rows into the table based on conditions. It combines the functionality of INSERT and UPDATE statements.
Example answer:
A MERGE statement in PL/SQL allows you to conditionally update or insert data into a table in a single statement. I used a MERGE statement to synchronize data between two tables, updating existing records if they matched on a key field, and inserting new records if they didn't exist in the target table. It's an efficient way to handle complex data synchronization tasks.
## 20. What is the difference between the “verify” and the “feedback” command?
Why you might get asked this:
This question tests your knowledge of SQLPlus commands and how to use them for debugging and monitoring. This question assesses your familiarity with SQLPlus, which could be part of sql plsql interview questions.
How to answer:
Explain that the verify command is used to check the syntax of SQL statements, while feedback is related to displaying the number of rows affected by operations.
Example answer:
The "verify" command in SQLPlus is used to show the text of the SQL command that you're about to execute, while the "feedback" command controls whether SQLPlus displays the number of records affected by a SQL statement. I used the verify command to review complex queries.
## 21. Explain the use of the %FOUND attribute in PL/SQL.
Why you might get asked this:
This question assesses your understanding of cursor attributes and how to check if a cursor has retrieved any rows. It may be included as part of sql plsql interview questions that explore cursor usage.
How to answer:
Explain that the %FOUND attribute is used to check if a cursor has retrieved any rows. It is TRUE if the cursor has retrieved rows, FALSE otherwise.
Example answer:
The %FOUND attribute in PL/SQL is used to determine whether the most recent SQL statement executed by a cursor returned any rows. It returns TRUE if a row was fetched successfully, and FALSE otherwise. When writing a function that retrieves employee information, I use %FOUND to check. This helps avoid errors when no employee is found.
## 22. What is the purpose of the %NOTFOUND attribute?
Why you might get asked this:
This question, similar to the previous one, tests your understanding of cursor attributes and how to handle cases where no rows are retrieved. Expect to field questions regarding cursor attributes when discussing sql plsql interview questions.
How to answer:
Explain that the %NOTFOUND attribute is TRUE if the cursor has not retrieved any rows, FALSE otherwise. It is the opposite of %FOUND.
Example answer:
The %NOTFOUND attribute in PL/SQL is used to check if a cursor fetch operation failed to return a row. It returns TRUE if no row was fetched and FALSE if a row was successfully fetched. I typically use %NOTFOUND in my loops to exit gracefully when there are no more records to process. It's a common technique to avoid infinite loops.
## 23. How do you implement exception handling in PL/SQL?
Why you might get asked this:
This question tests your ability to write robust code that can handle errors gracefully. Error handling is a crucial part of any coding role, and sql plsql interview questions will almost certainly cover this.
How to answer:
Explain that exception handling is implemented using the EXCEPTION block in a PL/SQL program, where specific or general exceptions are caught and handled. Provide examples of how to handle different types of exceptions.
Example answer:
In PL/SQL, exception handling is implemented using the EXCEPTION block. When an error occurs, the control is transferred to the EXCEPTION block, where you can handle specific or general exceptions. For example, I’ve used exception handling to catch the NODATAFOUND exception when querying a table, logging the error and returning a default value to the calling program. This ensures the program doesn’t crash and provides useful debugging information.
## 24. What is a collection in PL/SQL?
Why you might get asked this:
This question assesses your understanding of collection types and how to use them to store and manipulate data. Collection types are a focus of some sql plsql interview questions due to their flexibility.
How to answer:
Explain that a collection is a data structure that holds a set of values. It can be an associative array, a nested table, or a varray.
Example answer:
A collection in PL/SQL is a data structure that holds multiple elements of the same data type. The main types of collections are associative arrays, nested tables, and varrays. I used a nested table to store a list of product prices, which allowed me to easily calculate the average price and identify any outliers. Collections are very useful for processing sets of data.
## 25. What is an associative array in PL/SQL?
Why you might get asked this:
This question tests your knowledge of associative arrays and how they differ from other collection types. Interviewers explore your experience with these types of collections in sql plsql interview questions.
How to answer:
Explain that an associative array is a type of collection where each element is identified by a key. The key can be of any scalar data type, such as VARCHAR2 or NUMBER.
Example answer:
An associative array in PL/SQL, also known as an index-by table, is a collection type where elements are accessed using a key, similar to a hash table. For example, I used an associative array to store configuration settings for a system, where the key was the setting name and the value was the setting value. This made it very easy to retrieve specific settings by name. They offer a flexible way to organize and access data.
## 26. What is the difference between a function and a procedure in terms of compilation?
Why you might get asked this:
This question tests your understanding of how functions and procedures are handled by the PL/SQL compiler. Expect the interviewer to dig into compilation when asking you sql plsql interview questions.
How to answer:
Explain that both functions and procedures are compiled before execution, but functions must always return a value, whereas procedures might not.
Example answer:
Both functions and procedures in PL/SQL are compiled and stored in the database. However, a function must always return a value, and its return type must be declared in the function definition. If a function doesn't return a value, it results in a compilation error. Procedures, on the other hand, do not need to return a value. In a recent database project, the proper use of functions and stored procedures was critical to the success of the project.
## 27. Explain parameter passing modes in PL/SQL.
Why you might get asked this:
This question assesses your understanding of how parameters are passed to procedures and functions. Parameter passing is a key programming concept that’s relevant when assessing your knowledge via sql plsql interview questions.
How to answer:
Explain that parameters can be passed in three modes: IN, OUT, and IN OUT. Describe the purpose of each mode and how they are used.
Example answer:
In PL/SQL, parameters can be passed to subprograms (procedures and functions) in three modes: IN, OUT, and IN OUT. IN parameters pass values into the subprogram, and the subprogram cannot modify them. OUT parameters are used to return values from the subprogram, and the initial value of the parameter is ignored. IN OUT parameters pass values into the subprogram, and the subprogram can modify them, allowing you to both pass data in and receive data back. I recently used IN OUT to increment the value in the procedure.
## 28. What is a COMMIT statement?
Why you might get asked this:
This question tests your knowledge of transaction control in SQL and PL/SQL. This is a core part of many sql plsql interview questions.
How to answer:
Explain that the COMMIT statement is used to save changes made by a transaction to the database.
Example answer:
The COMMIT statement in SQL is used to permanently save all changes made during the current transaction. Once a COMMIT is issued, the changes are visible to other users and cannot be rolled back. In my previous role, I always ensured to use COMMIT after successful completion of a series of database operations to prevent data loss. Understanding proper transaction control is very important.
## 29. What is a ROLLBACK statement?
Why you might get asked this:
This question, along with the previous one, tests your understanding of transaction control in SQL and PL/SQL. Interviewers might pair these types of questions together when exploring your background with sql plsql interview questions.
How to answer:
Explain that the ROLLBACK statement is used to undo changes made by a transaction. It reverts the database to its previous state before the transaction began.
Example answer:
The ROLLBACK statement in SQL is used to undo any changes made during the current transaction. It restores the database to the state it was in before the transaction started. In a financial application, I used a ROLLBACK statement to revert a transaction when an error occurred during a funds transfer. This ensured data consistency and prevented incorrect transactions.
## 30. How do you create an index in PL/SQL?
Why you might get asked this:
This question tests your knowledge of database performance optimization techniques. Indexes are often discussed when approaching sql plsql interview questions.
How to answer:
Explain that an index is created using the CREATE INDEX statement. It improves query performance by allowing faster data retrieval.
Example answer:
To create an index in PL/SQL, you use the CREATE INDEX statement. For example, if you frequently query a table based on a specific column, creating an index on that column can significantly improve query performance. In a reporting database, I created indexes on columns used in WHERE clauses of common queries. This reduced query execution time, improving the overall performance of the reporting system.
Other tips to prepare for a sql plsql interview questions
Preparing for sql plsql interview questions requires more than just memorizing answers. Practice is key. Consider using mock interviews to simulate the real interview experience. Verve AI’s Interview Copilot is your smartest prep partner—offering mock interviews tailored to roles related to SQL and PL/SQL. Start for free at Verve AI. Develop a study plan that covers all the key topics, from basic syntax to advanced concepts. Remember to focus on understanding the underlying principles, not just memorizing syntax. Finally, don't be afraid to admit when you don't know the answer to a question. It's better to be honest and show a willingness to learn than to try to bluff your way through.
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Frequently Asked Questions
Q: What are the most important topics to study for sql plsql interview questions?
A: Focus on understanding SQL fundamentals, PL/SQL syntax, stored procedures, triggers, exception handling, and performance optimization techniques.
Q: How can I improve my problem-solving skills for sql plsql interview questions?
A: Practice writing SQL and PL/SQL code to solve various problems. Work through coding challenges, analyze existing code, and try to optimize it.
Q: What should I do if I don't know the answer to a sql plsql interview question?
A: Be honest and admit that you don't know the answer. However, show a willingness to learn and explain how you would approach finding the solution.
Q: How can I prepare for behavioral questions in a sql plsql interview questions interview?
A: Prepare examples from your past experiences that demonstrate your skills in teamwork, problem-solving, communication, and leadership. Use the STAR method (Situation, Task, Action, Result) to structure your answers.
