Interview Questions Answers in SQL PLSQL, C, Web Design

Explain the PL/SQL compilation process.

Answer

The PL/SQL compilation process involves:
• Parsing: The PL/SQL code is checked for syntax errors.
• Compilation: The code is converted into a format the Oracle Database can execute.
• Storage: The compiled code is stored in the database.
• Execution: When the PL/SQL code is called, it is executed by the database engine.

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Question { 1354 }

Tell me what a package consists of.

Answer

A PL/SQL package contains related procedures, functions, variables, and other PL/SQL constructs. It consists of two main parts:
• Package Specification: This defines the public interface of the package, including procedures, functions, and global variables that other programs can access.
• Package Body: This contains the actual implementation of the functions and procedures defined in the specification.

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Question { 1552 }

What are the benefits of using PL/SQL packages?

Answer

Using PL/SQL packages offers several benefits, including:
• Encapsulation: You can encapsulate related code and data within a package, promoting modular and organized code.
• Reusability: Packages allow you to reuse code across multiple programs and reduce redundancy.
• Information Hiding: You can hide implementation details by exposing only the necessary interfaces in the package specification.
• Improved Performance: Packages are precompiled and stored in the database, which can enhance performance.

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Question { 1185 }

Do you understand the meaning of exception handling?

Answer

Yes, exception handling in PL/SQL is the process of handling errors or exceptional conditions that may occur during program execution. It allows you to gracefully handle errors by specifying actions to take when a particular exception occurs, such as logging the error, rolling back transactions, or raising custom exceptions.

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Question { 2104 }

Give me some examples of predefined exceptions.

Answer

Predefined exceptions in PL/SQL include:
• NO_DATA_FOUND: Raised when a SELECT statement returns no rows.
• TOO_MANY_ROWS: Raised when a SELECT INTO statement retrieves multiple rows.
• DUP_VAL_ON_INDEX: Raised when attempting to insert a duplicate value into a specific index.
• ZERO_DIVIDE: Raised when dividing by zero.

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Question { 1197 }

What is a Deque?

Answer

A double-ended queue is called a deque.
You can add or remove components from either end of this structure.

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Question { 1042 }

Which sorting algorithm is the best?

Answer

Bubble sort, fast sort, balloon sort, merge sort, radix sort, and more are examples of the various kinds of sorting algorithms.
Since each algorithm was created for a certain kind of data structure where it works best, none of them can be regarded as the best or fastest.

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Question { 1039 }

How does variable declaration affect memory?

Answer

The type of data contained in that variable determines how much memory has to be allocated or reserved.
If a variable is designated as "integer type," for instance, 32 bits of memory storage will be set aside specifically for that variable.

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Question { 1227 }

How do you determine if a string is a palindrome?

Answer

When the order of the characters in a string is reversed and the string remains unchanged, it is called a palindrome.
One way to accomplish this is to first reverse the original string and then determine whether the reversed string is identical to the original string.

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Question { 866 }

What is a usability test, and how do you conduct it?

Answer

A usability test evaluates how easily users can complete tasks in a product. It involves defining tasks, observing users as they attempt them, collecting feedback, and analyzing the results for improvements.

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Question { 1091 }

How do you measure the success of a UI/UX design?

Answer

Metrics like task completion rate, time-on-task, error rate, Net Promoter Score (NPS), and user feedback are used to evaluate the success of a design.

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Question { 901 }

What is the heuristic evaluation method in UX?

Answer

Heuristic evaluation involves assessing a product based on established usability principles (heuristics) to identify usability issues, such as Nielsen's 10 usability heuristics.

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Question { 1475 }

How do you manage tight deadlines in design projects?

Answer

I prioritize tasks, focus on essential features, use agile methods to iterate quickly, and ensure clear communication with the team to avoid unnecessary delays.

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Question { 898 }

What are common UX design challenges, and how do you overcome them?

Answer

Challenges include balancing user needs with business goals, designing for diverse audiences, and ensuring accessibility. I address these through user research, prioritization, and iterative testing.

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Question { 866 }

How do you stay updated with UI/UX trends?

Answer

I follow design blogs (like Smashing Magazine, UX Collective), participate in webinars, take online courses, and engage in design communities on platforms like Dribbble and Behance.

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