Explain the different between all four types of views available.
The two main types of views (or “projections”) used in drawings are: pictorial. orthographic....There are three types of pictorial views:
Answer. Explanation: It is true that a view can be created based on other views, and rows do can be inserted and deleted from a view.
The basic difference between View and Materialized View is that Views are not stored physically on the disk. On the other hands, Materialized Views are stored on the disc. View can be defined as a virtual table created as a result of the query expression.
You can insert, update, and delete rows in a view, subject to the following limitations: If the view contains joins between multiple tables, you can only insert and update one table in the view, and you can't delete rows. You can't directly modify data in views based on union queries.
What cannot be done on a view? Explanation: In MySQL, 'Views' act as virtual tables. It is not possible to create indexes on a view. However, they can be used for the views that are processed using the merge algorithm.
DML operations could be performed through a simple view. DML operations could not always be performed through a complex view. INSERT, DELETE and UPDATE are directly possible on a simple view. We cannot apply INSERT, DELETE and UPDATE on complex view directly.
Views make queries faster to write, but they don't improve the underlying query performance. ... Once we create an indexed view, every time we modify data in the underlying tables then not only must SQL Server maintain the index entries on those tables, but also the index entries on the view.
Oracle's solution to improving performance of standard views is the materialized view. ... Since all of the query joins have been done, running SQL against the materialized view will be far faster than with a standard view.
No, a view is simply a stored text query. You can apply WHERE and ORDER against it, the execution plan will be calculated with those clauses taken into consideration.
The falsehood is that Views are slower because the database has to calculate them BEFORE they are used to join to other tables and BEFORE the where clauses are applied. If there are a lot of tables in the View, then this process slows everything down.
The first index created on a view must be a unique clustered index. ... Creating a unique clustered index on a view improves query performance because the view is stored in the database in the same way a table with a clustered index is stored. The query optimizer may use indexed views to speed up the query execution.
To enhance the performance of such complex queries, a unique clustered index can be created on the view, where the result set of that view will be stored in your database the same as a real table with a unique clustered index. ... Changing the data directly from the indexed view is possible but shouldn't be done.
Creating Triggers
Trigger: A trigger is a stored procedure in database which automatically invokes whenever a special event in the database occurs. For example, a trigger can be invoked when a row is inserted into a specified table or when certain table columns are being updated.
Different Types of Triggers In SQL Server
Triggers are anything that remind someone of previous trauma. To be triggered is to have an intense emotional or physical reaction, such as a panic attack, after encountering a trigger.
Here, I'll discuss three types of trigger: external, internal, and synthetic. These each have different strengths and weaknesses, and each can be used to design great behaviors that form lasting habits. Let's look more closely at each type of trigger.
Triggers can take many forms. They may be a physical location or the anniversary of the traumatic event. A person could also be triggered by internal processes such as stress.
Some examples of common triggers are:
Trigger warnings: These should be used to prevent exposing someone with past trauma, to something that might insight a physical and/pr mental reaction e.g., sexual violence.
5 Techniques to Heal Your Emotional Triggers
Coping With Triggers
Here's how to cope if a friend is triggered and help them get over the fallout.
There are many common triggers for anger, such as losing your patience, feeling as if your opinion or efforts aren't appreciated, and injustice. Other causes of anger include memories of traumatic or enraging events and worrying about personal problems.
Signs You've Been Triggered: Examples of Trauma Symptoms