Обсуждение: PgAmin view

If a PgAmin view is created and tables it queries are missing, what will happen?

If a PdAmin view is created, and it may take 20 hours to complete, what will happen?

Would views automatically run, when you start the PgAmin?

On 10/26/23 03:56, Shaozhong SHI wrote:
> If a PgAmin view is created and tables it queries are missing, what will 
> happen?

Easy enough to test:

create view test_vw as select * from non_existent_table;
ERROR:  relation "non_existent_table" does not exist
LINE 1: create view test_vw as select * from non_existent_table;

> 
> If a PdAmin view is created, and it may take 20 hours to complete, what 
> will happen?


Docs:

https://www.postgresql.org/docs/current/sql-createview.html

"CREATE VIEW defines a view of a query. The view is not physically 
materialized. Instead, the query is run every time the view is 
referenced in a query."

> 
> Would views automatically run, when you start the PgAmin?


See above. The view query will not execute until specifically asked for 
and nothing I have seen in my limited use of pgAdmin does that 
automatically.

> 
> Regards,
> 
> David

-- 
Adrian Klaver
adrian.klaver@aklaver.com