SQL Server Step by Step + SQL Interview Q&A Tutorial

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SQL Server Step by Step + SQL Interview Q&A Tutorial

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Learn SQL Server Step by Step

Lab 1: - Basic Fundamentals Database, Tables, rows and columns.
Lab 2: - Primary key, foreign key, referential integrity and constraints.
Lab 3: - Database Normalization (1st, 2nd and 3rd normal forms).
Lab 4: - SQL basics(Select, Insert, Update and Delete)
Lab 5: - DDL (Data definition language) Queries.
Lab 6: - Transactions, Locks and Isolation level in SQL Server.
Lab 7: - ISNULL and Coalesce functions.
Lab 8: - Row_Number, Partition, Rank and DenseRank
Lab 9: - Triggers, inserted and deleted tables
Lab 10: - Instead of and after triggers.
Lab 11: - Denormalization, OLTP and OLAP.
Lab 12: - Understanding Star schema and Snow flake design.
Lab 13: - SQL Server 8 kb pages.
Lab 14: - Index and performances
Lab 15: - Page Split and indexes
Lab 16:- Clustered vs non-clustered
Lab 17: - Stored procedures and their importance.
Lab 18: - Change Data Capture.
Lab 19: - Explain Columnstore Indexes?
Lab 20: - SQL Server agent
Lab 21: - How can we implement Pivot & Unpivot in SQL Server?

SQL Performance Tuning

Basics:- Query plan, Logical operators and Logical reads
Point 1:- Unique keys improve table scan performance.
Point 2:- Choose Table scan for small & Seek scan for large records
Point 3:- Use Covering index to reduce RID (Row Identifier) lookup
Point 4:- Keep index size as small as possible.
Point 5:- use numeric as compared to text data type.
Point 6:- use indexed view for aggregated SQL Queries
Point 7:- Database Engine tuning advisor is your best friend.
Part 1 - Profiler, Tuning advisor, Clustered/Non-clustered indexes,DBCC command & Reading SQL Plan, OLTP & OLAP.
Part 2 - Estimated vs Actual plan/rows, SQL Plan revised, Table/Index scan, Indexes seek, Physical/Logical opertn, Execution mode, columnstore, Rebinds, Rewinds, Nested loop, Hash/Merge join
Part 3 - Interleaved Execution, Fragmentation, Performance counters, Page splits and Unused Indexes
Part 4 - Extended events, RID lookup and Covering indexes
Part 5 - Indexed views, Page splits & unused indexes, Dead locks, Query store Parameter sniffing Statistics
Part 6 - Inline vs Stored procedure SQL, Cache miss, Cache hit, Parameter sniffing and Query store.
Part 7 - Partitioning, Wait stats, Resource Governor, Inmemory Tables
SQL Server Interview Questions & Answers

SQL Server Interview Questions & Answers - Part 1 :-
Question 1 :- Explain normalization ?
Question 2 :- How to implement normalization ?
Question 3 :- What is denormalization ?
Question 4 :- Explain OLTP vs OLAP ?
Question 5 :- Explain 1st,2nd and 3rd Normal form ?
Question 6 :- Primary Key vs Unique key ?
Question 7 :- Differentiate between Char vs Varchar ?
Question 8 :- Differentiate between Char vs NChar ?
Question 9 :- Whats the size of Char vs NChar ?
Question 10 :- What is the use of Index ?
Question 11 :- How does it make search faster?
Question 12 :- What are the two types of Indexes ?
Question 13 :- Clustered vs Non-Clustered index?
Question 14 :- Function vs Stored Procedures?
Question 15 :- What are triggers and why do you need it ?
Question 16 :- What are types of triggers ?
Question 17 :- Differentiate between After trigger vs Instead Of ?
Question 18 :- What is need of Identity ?
Question 19 :- Explain transactions and how to implement it ?
Question 20 :- What are inner joins ?
Question 21 :- Explain Left join ?
Question 22 :- Explain Right join ?
Question 23 :- Explain Full outer joins ?
Question 24 :- Explain Cross joins ?
SQL Server 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 Server 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 Interview Questions & Answers - Part 4 :-
Question 50:- Find NTH Highest Salary in SQL.
SQL Interview Questions & Answers - Part 5
Question 51:-  Select the top nth highest salary using correlated Queries?
Question 52:-  Select top nth using using TSQLQuestion 53:-  Performance comparison of all the methods.

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