What is the purpose of a virtual table?

The virtual table is a lookup table of functions used to resolve function calls in a dynamic/late binding manner. The virtual table sometimes goes by other names, such as “vtable”, “virtual function table”, “virtual method table”, or “dispatch table”.

What is virtual table in view?

A virtual table allows you to insert an SQL statement into the view which brings back a set of derived fields and used as a logical table in the view builder. Virtual tables have the following advantages: Reducing the amount of data returned in a query.

Why views are called virtual tables?

Views are a special version of tables in SQL. They provide a virtual table environment for various complex operations. The view is a query stored in the data dictionary, on which the user can query just like they do on tables. It does not use the physical memory, only the query is stored in the data dictionary.

Where are SQL virtual tables stored?

Virtual tables are views that are logical structures that are created based on one or more tables and applying complex functions and clauses like GROUP BY on an optional basis. This is nothing but the query statement that is stored in the data dictionary.

Can we create virtual tables in SQL?

Go to Organize > Data quality > Workspaces, and find the workspace where you want to add the SQL virtual table. From the action menu, select Create SQL virtual table. Provide the host, database, schema where you want to save the virtual table, and a name for your table.

Is a virtual table based on a SELECT query?

A view is a virtual table based on a SELECT query. A sequence is not associated with a table and can be dropped from a database with a DROP SEQUENCE command.

What is meant by magic table in SQL?

There are Magic Tables (virtual tables) in SQL Server that hold the temporal information of recently inserted and recently deleted data in the virtual table. A magic table can be utilized in INSERT, UPDATE, and DELETE activity with the table in a trigger, which is the common understanding of people.

What is magic table in SQL?

Magic tables are the temporary logical tables that are created by the SQL server whenever there are insertion or deletion or update( D.M.L) operations. The recently performed operation on the rows gets stored in magic tables automatically. These are not physical table but they are just temporary internal tables.