I am trying to design a DW Process and I heard about Indexed views. Actually I want to create a view and it should update automatically when base tables are changed.
Basically, all I need to do is:
Want to create a regular view
Then, Want to create a clustered index on that view
Can explain with an query example..
Related
Hi I would like to be able to update a view to point to a table in a different schema as in example below, change SCHEMA1 to SCHEMA2. No other change to the SQL.
Can anyone suggest an efficient way to achieve this, ideally a string replacement.
I can do CREATE OR REPLACE FORCE VIEW and provide the list of fields. This doesn't seem a good option as I have about 40 views re repoint.
CREATE OR REPLACE FORCE VIEW CUST.CustOrdersView as
SELECT field1, field2 etc.. from
SCHEMA1.CUSTOMER ;
Your problem is simply that you have hardcoded the schema name in the views' queries. Instead of that you could have created a synonym:
create synonym CUSTOMER for SCHEMA1.CUSTOMER;
Then in your view you would have simply referenced CUSTOMER.
To repoint the view to another schema you would have to change the synonyms:
create or replace synonym CUSTOMER for SCHEMA2.CUSTOMER;
That's still work but it's much easier to generate those statements from the data dictionary views than it is to change all the view queries.
(If there is a namespace clash - that is, if schema which owns the views already has an object called CUSTOMER - you would need to use a different name for the schema.)
You may not regard this as a helpful answer, because it doesn't really solve your current problem, but it may help you avoid a similar situation in the future.
How to display the view definition of a hive view in its SQL form.
Most relational databases supports commands like
SHOW CREATE VIEW viewname;
Use show create table.
Read the hive manual for more detail.
It is DESCRIBE [EXTENDED|FORMATTED] also. show create table doesn't give enough information sometimes, but DESCRIBE always does;
For a view, DESCRIBE EXTENDED or FORMATTED can be used to retrieve the view's definition. Two relevant attributes are provided: both the original view definition as specified by the user, and an expanded definition used internally by Hive.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-DescribeTable/View/Column
SHOW CREATE table ;
Even thought its a view's definition that you'd like to get, the 'table' keyword has to be mentioned.
Yeah, You can use SHOW CREATE TABLE to display the CREATE VIEW statement that created a view.
Link for reference: Hive CREATE VIEW
I would like to create a forms in my Access database which will save data to existing tables. This data entry form will save all valid data to the specified tables.
Now I would like to restrict the table from direct entry, i.e. no one can edit/update data directly in tables.
So please suggest me know can I do this.
You can not make something readonly AND not readonly. The forms need the tables to be writable.
What you can do is hide the tables, see: http://office.microsoft.com/en-gb/access-help/show-or-hide-database-objects-HP005188361.aspx.
If you need the tables for lookups you can make a readonly query based on the table. You have to change the query type to snapshot.
I have a View in an SQL Server Database, which involves many different tables. I am using Linq to Entities to access the database, so I have no problem getting and showing view's result.
But the problem is when I want to modify some field in those results. As long as a view doesn't have a primary key, the Entity is read-only, so the question is:
Is there any way to modify the object with the view's data and save those changes in the corresponding tables?
Sorry for my english, but it's not my native language.
Thank you very much in advance!
There are some requirements for VIEW to be updatable. Take a look here. You say your view references many tables, so you have to implement INSTEAD OF trigger.
I have a doctrine data model with a table Person, however my Symfony application is only part of a bigger web application, which is build in Joomla. For a module, I need to add a number of fields from a view, which spans 8 tables with the person table. The view is already established for the Joomla part of things.
Short of creating a schema for all the tables involved, is there a way to arbitrarily join the view in my tableMethod? As another shortcut I am thinking of creating a minimal schema.yml table to just represent the field of the view that I need.
another solution would be to use native sql with doctrine