ERA Group Trainee Interview Questions and Answers

Blood relationship, Age, all aptitude question

Topic social media ,Evm Machine

Q1. Core java eception handing, oops concepts,and all
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Q2. String reverse program in_technical
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A program to reverse a string
• Use a loop to iterate through the characters of the string

• Swap the characters from the beginning and end of the string

• Continue swapping until the middle of the string is reached
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Q3. SQL_ joins inner joins
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Q4. Union and unionall difference
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UNION combines the result sets of two or more SELECT statements, while UNION ALL combines all rows from two or more SELECT statements.
• UNION removes duplicate rows from the result set, while UNION ALL does not.

• UNION requires that the number and order of columns in all SELECT statements be the same, while UNION ALL does not have this requirement.

• UNION is slower than UNION ALL because it performs a distinct operation, whi...read more
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