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SQL Server Interview Questions and Answers | SQL Interview Questions

20 Plus SQL Server Interview Questions and Answers For more SQL videos visit https://www.questpond.com/sql-server-... For more such videos visit http://www.questpond.com For more such videos subscribe https://www.youtube.com/questpondvide... Syllabus covered in this video :- 00:00 Introduction 01:22 Question 1 :- Explain normalization ? 04:45 Question 2 :- How to implement normalization ? 05:44 Question 3 :- What is denormalization ? 07:07 Question 4 :- Explain OLTP vs OLAP ? 10:40 Question 5 :- Explain 1st,2nd and 3rd Normal form ? 18:02 Question 6 :- Primary Key vs Unique key ? 20:02 Question 7 :- Differentiate between Char vs Varchar ? 21:32 Question 8 :- Differentiate between Char vs NChar ? 22:25 Question 9 :- Whats the size of Char vs NChar ? 23:32 Question 10 :- What is the use of Index ? 24:03 Question 11 :- How does it make search faster? 26:36 Question 12 :- What are the two types of Indexes ? 26:51 Question 13 :- Clustered vs Non-Clustered index 29:14 Question 14 :- Function vs Stored Procedures 33:27 Question 15 :- What are triggers and why do you need it ? 34:58 Question 16 :- What are types of triggers ? 36:57 Question 17 :- Differentiate between After trigger vs Instead Of ? 37:03 Question 18 :- What is need of Identity ? 38:10 Question 19 :- Explain transactions and how to implement it ? 42:55 Question 20 :- What are inner joins ? 45:00 Question 21 :- Explain Left join ? 46:25 Question 22 :- Explain Right join ? 46:40 Question 23 :- Explain Full outer joins ? 47:34 Question 24 :- Explain Cross joins ? SQL Interview Questions & Answers - Part 2 :- Question 25:-Why do we need UNION ? Question 26:-Differentiate between Union vs Union All ? Question 27:-can we have unequal columns in Union? Question 28:-Can column have different data types in Union ? Question 29:- Which Aggregate function have you used ? Question 30:- When to use Group by ? Question 31:- Can we select column which is not part of group by ? Question 32:- What is having clause ? Question 33:- Having clause vs Where clause Question 34:- How can we sort records ? Question 35:- Whats the default sort ? Question 36:- How can we remove duplicates ? Question 37:- Select the first top X records ? Question 38:- How to handle NULLS ? Question 39:- What is use of wild cards ? Question 40:- What is the use of Alias ? Question 41:- How to write a case statement ? Question 42:- What is self reference tables ? Question 43:- What is self join ? Question 44:- Explain the between clause ? SQL Interview Questions & Answers - Part 3 :- Question 45:- Explain SubQuery? Question 46:- Can inner Subquery return multiple results? Question 47:- What is Co-related Query? Question 48:- Differentiate between Joins and SubQuery? Question 49:- Performance Joins vs SubQuery? SQL Server Interview Questions & Answers - Part 4 :- Question 50:- Find NTH Highest Salary in SQL. SQL Server Interview Questions & Answers - Part 5 Question 51:- Select the top nth highest salary using correlated Queries? Question 52:- Select top nth using using TSQL Question 53:- Performance comparison of all the methods. 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