Foundever Software Developer Interview Questions and Answers

Q1. Union and union all difference
Ans. 
UNION combines the results of two or more SELECT statements, while UNION ALL includes duplicates.
• UNION removes duplicate rows, while UNION ALL retains all rows including duplicates

• UNION is slower than UNION ALL as it performs a distinct operation

• UNION requires the same number of columns in the SELECT statements, while UNION ALL does not have this restriction
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Q2. What is generic and non-generic collections
Ans. 
Generic collections allow storing any type of data, while non-generic collections are type-specific.
• Generic collections can store any type of data, such as List or Dictionary.

• Non-generic collections are type-specific, like ArrayList or HashTable.

• Generic collections provide type safety and better performance compared to non-generic collections.
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Q1. OOPS & CORE JAVA CONCEPTS
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Q2. Concepts such as Polymorphism and inheritance
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Q1. About DOT NET
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Q2. About Sql server
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Q1. Palindrome code
Ans. 
A palindrome is a word, phrase, or sequence that reads the same backward as forward.
• A simple example is the word 'radar'.

• Phrases like 'A man, a plan, a canal, Panama!' are also palindromes when ignoring spaces and punctuation.

• To check if a string is a palindrome, compare it to its reverse.

• In programming, you can use loops or built-in functions to reverse a string.
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Q2. Delete all the distinct records
Ans. 
To delete all distinct records, use a query to identify and remove duplicate entries.
• Identify distinct records using a query

• Delete duplicate entries from the database
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