For what purposes is the UNION operator used in SQL and how does it affect the query execution result?
Junior — Middle
300
Java
14621
265
What self-assessment do you give to your professional skills and knowledge?
Junior — Middle
300
298
Can an enumerable type implement an interface in a programming language?
Junior — Middle
296
If I call the toList() method on a Stream, will the result be an ArrayList or another collection type?
Junior — Middle
295
Have you had experience participating in an aviation hackathon or project events in this field?
Junior — Middle
295
What is the fundamental difference between a framework and a library in software development?
Junior — Middle
294
Will a new transaction be initiated when calling method b inside method a annotated with @Transactional?
Junior — Middle
294
Have you used the LinkedList data structure in your projects?
Junior — Middle
293
Could you explain what a Servlet is in the context of Java web development?
292
How can you guarantee the uniqueness of keys when using a HashMap data structure?
Junior — Middle
291
Can you explain what Metaspace in JVM is and how it differs from PermGen?
Junior — Middle
291
Why do you prefer to create your own exception classes instead of using standard ones?
Junior — Middle
291
What are the easiest methods you can use to ensure data consistency between threads?
Junior — Middle
291
Is it permissible for one of the columns in a composite unique key to contain a NULL value?
Junior — Middle
290
What are the advantages and disadvantages of using XML for configuring configuration files?
Junior — Middle
290
How can simultaneous modification of the same data by multiple users in a database be prevented?
Junior — Middle
290
What type of tree is used inside the TreeMap data structure?
Junior — Middle
290
How can transaction management be implemented within the Spring framework?
Junior — Middle
289
Explain the concept of full locking in database management and its features.
288