Скачать или смотреть Derived Table | Virtual Table | DT | Derived Table vs SubQuery | Table Value Constructor | Nested DT

Derived Table | DT | Virtual Table | Derived Table vs SubQuery | Table Value Constructor | Nested DT

Agenda:
------------
Q01. What is Derived Table and which version of SQL supports the Derived Table?
Q02. What is the difference between Derived Table and SubQuery?
Q03. Is Nested Derived Table and Recursive Derived Table allowed in SQL?
Q04. Can you use the Derived Table without the alias name?
Q05. Can you JOIN a table with the Derived Table?
Q06. Can you use a Derived Table in the WHERE clause?
Q07. Are duplicate column names allowed in the Derived Table?
Q08. Is an anonymous column name or column with no name is allowed in the Derived Table?
Q09. Can you use filter the record by applying the ORDER BY clause in the Derived Table?
Q10. Can you DELETE the records from the Derived Table? Does it also affect the actual underlying base table?
Q11. Can you UPDATE the records from the Derived Table? Does it also affect the actual underlying base table?
Q12. Can you INSERT the records from the Derived Table? Does it also affect the actual underlying base table?
Q13. Can you TRUNCATE the records from the Derived Table? Does it also affect the actual underlying base table?
Q14. What is the most common use of the Derived Table in SQL?
Q15. What is Table Value Constructor in SQL and how can you create it?
Q16. Can you specify the data types along with the column names in the Derived Table?
Q17. Can a Derived Table contain outer references in MS SQL?
Q18. How can you get the third highest salary using the Derived Table?
Q19. How can you check and remove the duplicate records using the Derived Table?
Q20. How can you apply multi-level aggregations in SQL?


The SQL Derived Table is nothing but a Subquery used in the From Clause.
A derived table must have an alias so that you can reference its name later in the query.
All columns of the DT must have names and all column names must be unique.
You cannot use order by clause unless the TOP clause is applied.


-- 3rd Highest Salary using DT

SELECT TOP 1 Salary FROM
(
SELECT Salary,
DENSE_RANK() OVER (ORDER BY SALARY DESC) AS DenseRank
FROM [dbo].[Payroll]
) DT
WHERE DenseRank = 3;


Subscribe to our YouTube Channel:    / @techpointfundamentals  
Visit our Website for more Articles: https://www.techpointfunda.com

Recommended Videos Playlists:
============================================================
SQL Videos Playlist: https://www.youtube.com/embed/videose...
C# Interview Questions and Answers Videos Playlist: https://www.youtube.com/embed/videose...
Visual Studio Tips and Tricks Videos Playlist: https://www.youtube.com/embed/videose...
Interview Questions and Answers Videos Playlist: https://www.youtube.com/embed/videose...
C# Videos Playlist: https://www.youtube.com/embed/videose...
C# 8 Videos Playlist: https://www.youtube.com/embed/videose...


Recommended SQL Videos:
============================================================
GO vs Semicolon(;) Terminator:    • GO vs Semicolon(;) Terminator | Batch Term...  
LEN vs DATALENGTH function:    • LEN vs DATALENGTH Function | CHAR vs VARCH...  
SET Statements Part-1 video:    • SET Statements Part-1 | QUOTED_IDENTIFIER ...  
Truncate vs Delete video:    • DELETE vs TRUNCATE | DELETE Command | TRUN...  
SubQuery vs CoRelated SubQuery:    • SubQuery vs Co-Related SubQuery | SubQuery...  
IN vs NOT IN Clause video:    • IN vs NOT IN Operator | IN Operator | NOT ...  
CROSS JOIN vs FULL JOIN video:    • CROSS JOIN vs FULL JOIN | FULL JOIN vs CRO...  

Recommended C# Interview Questions Videos:
============================================================
Sealed Class Interview QA Video:    • Sealed Class Interview Questions and Answe...  
Static Class Interview QA Video:    • Static Class Interview Questions and Answe...  
Abstract Class vs Interface Video:    • Abstract Class Vs Interface C# 8 | Differe...  

Recommended C# Videos:
============================================================
Abstract Class and Methods video:    • Abstract Class C# | Abstract Method C# | T...  
Sealed Class Video:    • Sealed Class and Sealed Methods in C# | Te...  
Static Class Video:    • Static Class, Static Constructor and Stati...  
Partial Classes Video:    • Partial Classes with Real Examples in C# |...  

Follow Us on Social Media Platforms:
============================================================
Follow us on Facebook:   / techpointfundamentalsofficials  
Visit our Facebook Page:   / techpointfundamentals  
Follow us on LinkedIn:   / techpointfundamentals  
Follow us on Telegram: https://t.me/TechPointFundamantals
Follow us on VK: https://vk.com/techpointfundamentals

Follow us on Twitter:   / techpointfunda  
Follow us on Pinterest:   / techpointfundamentals  
Follow us on Instagram:   / techpointfundamentals  
Follow us on Mix: https://mix.com/techpointfundmentals
Follow us on Tumblr:   / techpointfundamentals