Digitoonz Interview Questions and Answers

Link list program, few objective based on cpp

Q1. Good Core knowledge cpp
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Q2. Pointer, static , constant used in multiple scenario. Oops, STL
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Q1. Basic question about qualification about experience suitable for role or not
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Q1. Oops concepts should be strong.
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Q2. Strong knowledge with c#
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Q3. Asp .net, MVC, web APIs, .net core .
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Q1. Senior lead will take this round and deep knowledge of technology
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Q1. Manager round with skills and experience
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Q1. International call one to one
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Q1. Final discussion for salary and all
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Q1. What is the difference between Union and Union all ?
Ans. 
Union combines the results of two or more SELECT statements, while Union all includes all rows, including duplicates.
• Union removes duplicate rows from the result set, while Union all includes all rows.

• Union sorts the result set, while Union all does not.

• Union is slower than Union all because it performs a distinct operation.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FRO
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Q2. Which query is more faster , joins or union?
Ans. 
Joins are generally faster than unions.
• Joins are typically faster than unions because they combine data from multiple tables based on a common column, while unions combine data from multiple queries into a single result set.

• Joins can utilize indexes on the columns being joined, which can improve performance.

• Unions involve combining the results of multiple queries, which can be slower as it requires merging and sorting ...read more
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