How does views in database improve it's performance. Is quering between views create good performan

[blackbaron]

Hi,

I'm working on an application where I have the following doubt:

1. Does a view improve the performance of DB ?(Was unable to understand  even after reading the below reference)

2. In case I create 2 views and run a join query between them, will it affect the performance of the DB ?

3. I'm using Azure SQL DB for this project

Reference : 

https://docs.microsoft.com/en-us/sql/relational-databases/views/views?view=sql-server-ver15

https://docs.microsoft.com/en-us/sql/relational-databases/views/create-indexed-views?view=sql-server... 

https://docs.microsoft.com/en-us/sql/relational-databases/views/create-views?view=sql-server-ver15 

Any help on this is greatly appreciated!!

Regads,

black baron

PS: If this post has helped you, please vote for it.

[#2]

@blackbaron , a view is just a predefined query (like a macro) and has no effect on performance.

You can create an index on a view, but there are several limitations.

Better create index on the base table instead on a view; so that ad-hoc queries can also benefit of the index.

[#3]

Thanks @olafhelper :)
This answer gave me a direction. Hoping to see some other viewpoints too

[#4]

USE ETL tools put the datas into a table