20 CRUD Operations Interview Questions and Answers

CRUD Operations are the basic operations that can be performed on a database. They are Create, Read, Update and Delete. When applying for a position that involves working with databases, it is likely that you will be asked questions about CRUD Operations. Being able to confidently answer these questions can help you impress the interviewer and improve your chances of getting the job.

CRUD Operations Interview Questions and Answers

Here are 20 commonly asked CRUD Operations interview questions and answers to prepare you for your interview:

1. What is CRUD?

CRUD is an acronym for Create, Read, Update, and Delete. CRUD operations are the basic operations that can be performed on data in a database.

2. Can you give me some examples of situations where CRUD operations are used to manipulate data in a database?

CRUD operations are the most basic and essential ways to interact with data in a database. They are used for everything from creating new records to updating existing ones, and can even be used to delete data entirely. In short, any time you need to add, change, or remove data from a database, you will be using CRUD operations.

3. What do you understand about the Create, Read, Update and Delete functions? How would you implement them in Python or any other programming language?

The CRUD functions are the basic functions that allow you to interact with a database. In order to create, read, update or delete data from a database, you need to use these functions. In Python, you can use the sqlite3 module to interact with a SQLite database.

4. Why are CRUD operations considered to be important in the context of databases?

CRUD operations are important because they provide the basic functions for interacting with a database. CRUD stands for Create, Read, Update, and Delete. These operations allow you to create new entries in the database, read and retrieve existing data, update existing data, and delete data that is no longer needed. Without these basic operations, it would be very difficult to work with a database.

5. What’s your opinion on the use of ORMs for data access? Are they better than using plain SQL queries?

I believe that ORMs can be very helpful for data access, especially when working with complex data structures. However, they can also add a lot of overhead and can be slower than plain SQL queries. It really depends on the situation and the data involved.

6. Why don’t you think that CRUD operations can help reduce the complexity of an application’s architecture?

CRUD operations are very basic and do not help to reduce the complexity of an application’s architecture. In fact, they can often add to the complexity, as they need to be implemented in a way that is consistent with the rest of the application.

7. Is it possible to create a new object without using the “Create” operation in CRUD? If yes, then how?

Yes, it is possible to create a new object without using the “Create” operation in CRUD. This can be done by using the “Update” operation instead. To do this, you would first need to retrieve the object that you want to update. Once you have retrieved the object, you can then modify it as needed and save it back to the database. This will effectively create a new object without using the “Create” operation.

8. Are all database systems capable of supporting CRUD operations? If not, what kind of database system doesn’t support these operations?

CRUD operations are the most basic database operations, so most database systems are capable of supporting them. The only kind of database system that wouldn’t support CRUD operations would be a very basic, non-relational database system.

9. What are some common pitfalls when implementing CRUD applications?

There are a few common pitfalls when implementing CRUD applications. First, it is important to make sure that your application is properly secured. This means ensuring that only authorized users can access and modify data. Second, you need to make sure that your application is scalable. This means that it can handle increased loads as more users are added. Finally, you need to make sure that your application is reliable. This means that data is not lost and that users can always access the data they need.

10. In which scenarios should we avoid using CRUD operations?

CRUD operations should be avoided in scenarios where data needs to be processed in a specific order or where data dependencies exist. For example, if you are processing a list of items and the order in which they are processed matters, then CRUD operations are not the best choice. The same is true if you are working with data that has dependencies (e.g. items that need to be processed before other items can be processed). In these cases, it is better to use a different type of operation that can take into account the specific order or dependencies.

11. Can you explain how to apply CRUD operations in MongoDB?

CRUD stands for Create, Read, Update, and Delete. In MongoDB, these operations can be performed on documents in a collection. To create a document, you can use the insert() or save() method. To read a document, you can use the find() method. To update a document, you can use the update() method. To delete a document, you can use the remove() method.

12. How do you apply CRUD operations in Oracle?

In Oracle, you can use the CREATE, UPDATE, and DELETE statements to apply CRUD operations. To create a new record, you would use the CREATE statement. To update an existing record, you would use the UPDATE statement. To delete a record, you would use the DELETE statement.

13. How do you ensure database integrity while applying CRUD operations?

There are a few ways to ensure database integrity while applying CRUD operations. One way is to use transactions. This means that all of the operations in a given CRUD sequence will either all be applied, or none of them will be applied. This ensures that the database is left in a consistent state. Another way to ensure database integrity is to use locks. This ensures that two users cannot be trying to modify the same data at the same time, which could lead to inconsistency.

14. How can you track changes made to data stored in a database through CRUD operations?

There are a few ways to track changes made to data stored in a database through CRUD operations. One way is to use a database management system that supports auditing, such as Microsoft SQL Server. This will allow you to track who made what changes and when they were made. Another way is to create your own custom logging system that tracks changes made to the database. This can be done by creating triggers on the database tables that log changes to a separate table, or by writing code to log changes made to the database.

15. What are some best practices you recommend around using CRUD operations?

There are a few best practices I recommend when using CRUD operations:

1. Keep your CRUD operations as atomic as possible. This means that each operation should only affect a single piece of data, and not multiple pieces of data.

2. Make sure that you validate your data before performing any CRUD operations on it. This will help to ensure that the data you are working with is clean and consistent.

3. When deleting data, be sure to use a soft delete rather than a hard delete. This means that the data is not actually removed from the database, but is instead marked as deleted. This allows you to undelete the data if necessary.

16. What is the main difference between CRUD operations and RPC?

CRUD operations are the basic operations that can be performed on data, while RPC (Remote Procedure Call) is a way of calling functions or procedures that are located on a remote server. CRUD operations are typically used for simple data manipulation, while RPC is used for more complex tasks that require interaction with a remote server.

17. Which one do you prefer and why – CRUD operations or Stored Procedures?

I prefer CRUD operations because they are more flexible and allow me to work directly with the data. Stored procedures can be more difficult to work with and can be less flexible.

18. What is RESTful API? Can you compare it with CRUD operations?

RESTful API is an architectural style for building web services. It is based on the principles of Representational State Transfer (REST). A RESTful API is typically made up of a number of different URL endpoints, each of which is used to perform a different CRUD operation. For example, one endpoint might be used to create a new resource, another might be used to retrieve an existing resource, and another might be used to update an existing resource.

19. What are some common techniques for identifying test cases for CRUD operations in software testing?

There are a few different ways to identify test cases for CRUD operations. One common way is to use equivalence partitioning, which involves dividing the input data into different equivalence classes and testing a representative sample of each class. Another common technique is boundary value analysis, which involves testing the input data at the boundary values (e.g. the minimum and maximum values) to see how the system behaves.

20. What is NOSQL? Do you think it makes sense to replace RDBMS with NOSQL?

NOSQL is a type of database that is designed to be scalable and easy to use. It is a good choice for applications that need to be able to handle a large amount of data. However, NOSQL databases are not as good at handling complex queries, so if your application needs to do a lot of data analysis, then an RDBMS may be a better choice.